GIA Colored Stones
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| show | Mineral
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| A substance that consists of atoms of only one kind is a | show 🗑
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| Most gems are | show 🗑
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| show | rock
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| Which of the following is amorphous? A. Beryl B. Amber C. Garnet D. Jadeite | show 🗑
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| A broad gem category based on chemical composition and crystal structure is a | show 🗑
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| Which of the following is a gem variety? A. Beryl B. Garnet C. Andradite D. Demantoid | show 🗑
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| Which group does almandine belong to? | show 🗑
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| The world’s largest gem-consuming market is | show 🗑
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| Synthetic gem materials | show 🗑
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| show | independent miners using small-scale mining methods
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| Media attention in the 1990s regarding its treatment reduced consumer confidence in | show 🗑
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| Most of the gems in Tanzania’s Umba River Valley are found in | show 🗑
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| Which is a key locality for hydrothermal gems? | show 🗑
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| Which gem can crystallize in volcanic rock from gasses released by magma? | show 🗑
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| A deposit where gems are found in the rock that carried them to the earth’s surface is called | show 🗑
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| show | Secondary
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| show | Tanzanite
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| Most gemstones form in the | show 🗑
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| show | Placer
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| show | beryllium, boron, and lithium
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| show | marble
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| show | Tourmaline, beryl, and kunzite are all found in association with pegmatites
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| show | too delicate to withstand abrasion
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| show | metamorphic
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| Which is a deposit where gems eroded from the source rock and remained in place nearby? | show 🗑
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| show | regional metamorphism
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| show | iron and titanium
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| show | trace elements
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| Many fashioned rubies have shallow proportions because they’re cut from | show 🗑
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| A two-phase inclusion is a cavity in a gem that’s typically filled with a | show 🗑
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| Rough spinel often occurs as | show 🗑
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| Needles of actinolite found in emerald are classified as | show 🗑
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| show | Polysynthetic
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| Which gems are cryptocrystalline aggregates? | show 🗑
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| show | Chromium
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| Which aggregate’s crystals are visible only with magnification greater than a standard gemological microscope’s? | show 🗑
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| show | small
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| An object’s weight in relation to its size is called its | show 🗑
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| show | basic identity
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| show | topaz
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| show | contact twins
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| The pattern of dark lines or bands shown by certain colored gems when viewed through a spectroscope is called | show 🗑
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| Which element does chromium substitute for to cause ruby’s red? | show 🗑
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| show | Iron
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| In many blue sapphires, the intervalence charge transfer that causes the color is between | show 🗑
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| What is the only type of gem that can show pleochroism? | show 🗑
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| Which components of a transition element’s atoms can produce color in gems? | show 🗑
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| show | Labradorescence
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| show | scattering of light
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| Which gem can show three pleochroic colors? | show 🗑
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| The process where electrons that selectively absorb light are passed back and forth between neighboring impurity ions is known as... | show 🗑
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| show | Chromium
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| Which transition element causes a greater variety of gem colors than any other? | show 🗑
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| show | chrysoberyl
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| When a gem’s crystal structure splits light into two rays that each travel at a slightly different speed and direction, it’s called... | show 🗑
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| show | IDIOCHROMATIC
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| Synthetic opal is grown using microscopic silica spheres that are produced by | show 🗑
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| A snakeskin structural pattern is typical of | show 🗑
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| Synthetic turquoise is most likely produced by which process? | show 🗑
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| show | Hydrothermal growth
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| show | pressurized steel container and crushed chemical ingredients
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| Which process dissolves nutrients in chemicals to form synthetic crystals? | show 🗑
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| show | solution
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| show | Flame fusion
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| Which process involves heating finely ground powder, sometimes under pressure, to produce a fine-grained solid material? | show 🗑
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| show | synthetic
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| show | Pulling
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| show | Quartz
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| The crucibles that work best for flux growth are made of | show 🗑
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| show | Floating zone
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| show | dissolves other materials
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| show | causing changes in color centers
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| show | deepens blue color in sapphire
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| Which of these is considered a gem treatment? | show 🗑
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| Written information on dyeing gems dates back to about | show 🗑
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| show | synthetic corundum
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| What agent can create a shallow layer of asterism when it’s introduced below the surface of a corundum cabochon by lattice diffusion? | show 🗑
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| Jadeite is often | show 🗑
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| show | refractive index as the gem
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| show | turquoise
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| show | Titanium oxide and iron oxide
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| show | opal
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| show | Amber
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| show | Golden beryl
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| show | 0.01 mm to 0.50 mm
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| show | aqua aura
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| Which location produces the majority of rubies that end up in mass-produced jewelry? | show 🗑
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| show | Mine run
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| Which of the following is a premium price for selecting stones from a parcel? A. Lot price B. Pick price C. Grade price D. Parcel price | show 🗑
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| show | pick
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| show | grade
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| show | Chantaburi
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| show | large, important stones
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| Where is rough from Mong Hsu brought into Thailand? | show 🗑
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| Which of the following is a quantity of stones, sometimes of similar size and quality, from a single mine or from many different sources? A. Parcel B. Mine lot C. Mine run D. Production run | show 🗑
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| show | calibrated sizes
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| Where is rough from Mogok brought into Thailand? | show 🗑
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| In mining terms, the theft of a mine’s production by its workers is known as | show 🗑
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| Which of the following is a price for buying an entire parcel of gems, or a substantial part of it? A. Lot price B. Cut price C. Pick price D. Grade price | show 🗑
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| show | middle market
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| What is Myanmar’s most important gem export? | show 🗑
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| show | HUE
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| Emission of visible light by a material when it’s exposed to invisible ultraviolet radiation is | show 🗑
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| show | gem’s actual source is known
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| A see-through area in a transparent gemstone’s bodycolor that usually results from the way the gem was cut is called | show 🗑
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| show | medium to medium-dark tone
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| What type of lighting is best for grading color in a colored stone? | show 🗑
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| Which trade term describes certain tourmalines? | show 🗑
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| Which gemstone occurs in almost every color? | show 🗑
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| show | deep pavilions
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| Which abbreviation does the GIA Colored Stone Grading System use for a slightly purplish red hue? | show 🗑
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| In practice, what GIA Colored Stone Grading tone levels apply to grading transparent colored stones? | show 🗑
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| Generally, cool-colored hues with low saturation look | show 🗑
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| A window usually differs from the rest of the stone in | show 🗑
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| show | Chromium and vanadium
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| show | neutral
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| Which type of rough is usually faceted? | show 🗑
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| show | cobbing
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| Which is a carved design that projects slightly from a flat or curved surface? | show 🗑
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| Which cutting stage has the greatest impact on the value of the finished gem? | show 🗑
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| show | face-up
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| The purpose of most variations in a colored stone’s face-up outline is to | show 🗑
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| show | between 25 and 40 percent brilliance
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| Which is most likely to undergo cobbing? | show 🗑
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| Excessive bulge on a step cut | show 🗑
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| Rough that’s ground to the approximate shape of the finished stone is called | show 🗑
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| Colored stones cut flat with shallow pavilions usually have areas of lower color intensity called | show 🗑
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| To retain as much weight as possible from rare, high-quality rough, cutters would most likely vary | show 🗑
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| show | Tanzanite
(Tanzanite has two directions of cleavage)
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| Translucent to opaque rough is often cut into a | show 🗑
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| Cutters can darken the color of pale stones by cutting a | show 🗑
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| In which colored stone clarity type are the gems usually eye-clean? | show 🗑
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| show | can help separate natural from synthetic gems
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| Fingerprints are | show 🗑
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| The term “silk” describes | show 🗑
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| An inclusion with the most negative impact on a colored stone’s clarity would be located | show 🗑
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| A general term for a break in a stone is | show 🗑
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| show | A large, unhealed feather
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| An angular, hollow space that resembles a mineral inclusion is called a | show 🗑
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| show | spodumene, yellow beryl, and aquamarine
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| show | Moderately included
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| show | Emerald
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| The highest clarity grade for colored stones is | show 🗑
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| A characteristic or irregularity confined to the surface of a polished gemstone is a | show 🗑
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| show | position and relief
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| show | crystal growth
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| If an emerald weighs 3.50 carats and the stone’s cost is $10,500.00, what is its per-carat price? | show 🗑
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| show | by weight
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| A metric carat equals | show 🗑
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| The international unit of measurement for gem weight is the | show 🗑
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| show | 5
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| What category of colored stone is often sold per piece? | show 🗑
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| If a parcel of sapphires weighs 382.00 cts. and the per-carat price is $80.00, what is the total cost of the parcel? | show 🗑
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| Individual stone prices are referred to as | show 🗑
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| Sieves are most useful for sorting round gems with diameters | show 🗑
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| show | $31,680.00
The price of this ruby (or its unit price) is $31,680.00. Multiply 5.76 cts. (carat weight) by $5,500.00 (per-carat price)
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| A gem’s price divided by its carat weight is called | show 🗑
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| Colored stones with higher values usually have | show 🗑
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| The color of a sorting pad should be | show 🗑
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| show | $1.16 Unit price is $1.16 x 1,542.00 cts. (parcel total carat weight) x $0.75 (price per carat) for the parcel price of $1,156.50. Divide $1,156.50 (parcel price) by 1,000 (total number of stones in parcel) for the unit price of $1.1565 rounded to $1.16
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| How many points are in a metric carat? | show 🗑
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| show | alkali-basalt
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| The world’s largest corundum marketing center is | show 🗑
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| Rubies that come from marble deposits are typically low in | show 🗑
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| Compared to rubies from Myanmar, most Thai rubies tend to be | show 🗑
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| show | Thailand.
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| show | marble
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| In ancient Sanskrit, ruby is called ratnaraj or | show 🗑
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| Newly discovered ruby deposits at Vatomandry and Andilamena are in what country? | show 🗑
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| show | Thailand
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| Corundum can form only in an environment that’s low in | show 🗑
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| Where are the Penny Lane and John Saul mines located? | show 🗑
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| show | eliminates dark centers or cores
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| show | Mong Hsu
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| Switzerland exports rubies that are primarily | show 🗑
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| show | medium to medium-dark tone and vivid saturation
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| show | 1881 to 1887
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| Blue sapphire’s most common crystal habit is | show 🗑
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| The most highly valued hues of blue sapphire are | show 🗑
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| What trace elements cause blue sapphire’s color? | show 🗑
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| When did Madagascar become a significant source of blue sapphire? | show 🗑
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| show | geuda
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| show | slightly greenish blue and slightly violetish blue
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| Most fine sapphires over 100 cts. come from | show 🗑
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| show | velvety appearance
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| show | Color zoning
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| Australian blue sapphire color is often described as | show 🗑
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| Which of the following sources emerged in the 1990’s as a significant source of good- to fine-quality sapphire? A. Kashmir B. Australia C. Sri Lanka D. Madagascar | show 🗑
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| The sapphire market level supplied by Switzerland is | show 🗑
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| Which location supplies sapphires that are most likely not heat-treated? | show 🗑
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| show | high iron content
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| show | hematite
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| show | readily available
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| Which color of star sapphire is usually cut shallow due to parting? | show 🗑
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| show | Australia
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| Which is the most prized body color in star corundum? | show 🗑
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| show | 1940s
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| show | Pink
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| show | semi-transparent
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| show | Padparadscha
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| Sapphire’s color change is caused by | show 🗑
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| Color-change sapphire typically changes from blue or violet to | show 🗑
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| Fancy sapphires from Montana tend to be | show 🗑
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| show | Chromium
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| show | 6 rays
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| The name padparadscha means | show 🗑
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| show | bluish green to green
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| show | US and Japan
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| show | Lechleitner
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| show | perpendicular to the crystal length.
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| show | pegmatites, where they intersect with schists
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| The four major emerald sources are Colombia, Zambia, Brazil, and | show 🗑
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| show | generally contain fewer fractures
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| What’s the estimated percentage of fashioned emeralds that contain filled fractures? | show 🗑
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| Which element makes emerald a bluer green? | show 🗑
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| The trade term “Zambian” describes emeralds with | show 🗑
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| One of Colombia’s traditional emerald mines is called | show 🗑
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| Emeralds were discovered in Zambia in the | show 🗑
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| show | 1950s
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| show | Muzo
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| Seed pearls are | show 🗑
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| The nacreous layer inside a pearl-bearing mollusk’s shell is called | show 🗑
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| show | an organic gem
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| A number of similar cultured pearl strands bundled together is called a | show 🗑
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| In the early 1990s, oysters in many important Japanese cultured pearl farming areas began to | show 🗑
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| The oyster used to grow Tahitian cultured pearls is | show 🗑
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| show | Australia
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| show | 1908
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| Which industry directly contributed to the decline of the natural pearl industry? | show 🗑
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| show | Tahitian.
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| show | mantle-tissue piece and a bead nucleus
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| show | the Philippines
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| Aragonite is a crystallized form of | show 🗑
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| show | mantle-tissue piece only
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| show | China
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| The matching level that describes a group of pearls that have minor variations in uniformity is | show 🗑
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| Essence d’orient is a mixture of | show 🗑
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| show | Wash, dry, and sort
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| Usually, the diameters of the cultured pearls in a hank vary from each other by no more than | show 🗑
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| show | Moderately Blemished
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| Which overtone color increases the value of akoya cultured pearls with white bodycolor? | show 🗑
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| show | Bead nucleus darkens
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| The nacre quality classification described as “Nucleus not noticeable, no chalky appearance” is | show 🗑
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| show | warm, mild soapy water
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| When mollusks live in cooler water, they form | show 🗑
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| show | round
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| show | low in saturation
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| Almost all akoya and Chinese freshwater pearls are | show 🗑
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| The largest gem-quality natural pearl known is the | show 🗑
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| In the trade, Tahitian cultured pearls with a dark green-gray to blue-gray bodycolor and rosé to purple overtones are called | show 🗑
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| In Myanmar, the center of the jadeite mining district is | show 🗑
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| show | semitransparent
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| Polar jade is actually a very fine-quality | show 🗑
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| Spinach jade is used to describe a color of | show 🗑
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| show | chromium
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| The finest texture category of jadeite is known as | show 🗑
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| Spots of color near the surface of a jadeite boulder, where the skin is thin enough to see through, are called | show 🗑
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| New Zealand is a major source of | show 🗑
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| Where was jadeite first fashioned and used as an ornamental object? | show 🗑
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| Type B jadeite is | show 🗑
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| show | exceptional
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| show | Imperial
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| Guatemala recently emerged as a valuable source of which of the following jadeite colors? | show 🗑
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| show | orange color
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| Type C jadeite is | show 🗑
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| show | silica
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| show | Opaque
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| What is the first step in evaluating an opal? | show 🗑
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| In opal, a pattern of large, distinct, usually rectangular patches of play-of-color with edges that touch each other is called | show 🗑
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| show | 3 to 10 percent water
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| Most opal formed | show 🗑
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| The type of matrix found as a layer in finished boulder opal is | show 🗑
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| Which treatment involves immersing opal in concentrated sulfuric acid? | show 🗑
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| show | Iron impurities
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| show | Pierre Gilson
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| Play-of-color that’s seen only when light travels through an opal to the eye is called | show 🗑
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| Plastic imitation opal was first marketed in the late 1980s in | show 🗑
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| What is the transparency range of white opal? | show 🗑
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| What is semi-black opal’s background color? | show 🗑
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| show | New South Wales
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| The color of chrysoprase is | show 🗑
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| One of amethyst’s finest colors is | show 🗑
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| show | Agate
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| show | produced by heating amethyst
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| The source of natural ametrine is | show 🗑
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| The major commercial-quality amethyst source is | show 🗑
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| Which of the following has the smallest crystal size? | show 🗑
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| show | microcrystalline aggregate
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| The trade term “black onyx” is used for | show 🗑
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| “Marabá” amethyst is often | show 🗑
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| show | Chalcedony
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| In the nineteenth century, a major source of amethyst was discovered in | show 🗑
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| The color of amethyst results from | show 🗑
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| show | Cat’s-eye quartz
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| show | heating
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| Almost all tanzanite is | show 🗑
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| show | Bluish green
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| The most-prized chatoyant gem in the world is | show 🗑
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| Top-color iolite is | show 🗑
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| Alexandrite was discovered in | show 🗑
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| Untreated tanzanite is typically | show 🗑
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| Tanavyte is a trade name for | show 🗑
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| show | Merelani
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| show | blue
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| Which of the following gems is the most economically important? | show 🗑
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| The color change in alexandrite is caused by | show 🗑
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| show | Tiffany & Co
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| What changes during alexandrite’s color-change effect? | show 🗑
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| show | strongly saturated blue or violetish blue
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| show | Sri Lanka
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| show | Colorless
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| The color of imperial topaz is | show 🗑
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| show | heat
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| show | yellow-to-orange stones
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| show | Ouro Prêto, Brazil
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| show | medium-dark blue to slightly greenish blue
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| Most gem-quality topaz comes from | show 🗑
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| show | Red beryl
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| show | China
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| What color is morganite beryl? | show 🗑
|
||||
| Which method is used to produce synthetic aquamarine? | show 🗑
|
||||
| show | Brazil
🗑
|
||||
| In order to attain a treated pink color, yellow to reddish brown topaz must contain | show 🗑
|
||||
| The most valuable topaz varieties are | show 🗑
|
||||
| The only source of red beryl is in | show 🗑
|
||||
| The most expensive variety of tourmaline is | show 🗑
|
||||
| show | heating
🗑
|
||||
| Which of the following is the largest producer of chrome tourmaline? | show 🗑
|
||||
| show | Copper
🗑
|
||||
| show 🗑
|
|||||
| show | Indicolite
🗑
|
||||
| The world’s largest producer of gem-quality tourmaline is | show 🗑
|
||||
| show | low zircons due to their lower properties
🗑
|
||||
| show | Myanmar
🗑
|
||||
| show | pegmatites
🗑
|
||||
| The color of blue zircon is usually | show 🗑
|
||||
| The cause of color in peridot is | show 🗑
|
||||
| Most of the world’s commercial-quality peridot is mined in | show 🗑
|
||||
| Many Paraíba tourmalines are | show 🗑
|
||||
| Rubellite tourmaline is colored by | show 🗑
|
||||
| show | grossularite
🗑
|
||||
| show | Grossularite than rhodolite, almandite, and spessartite
🗑
|
||||
| show | Russia during the 1800s
🗑
|
||||
| Rhodolite is a mixture of | show 🗑
|
||||
| Spessartite is most commonly found in | show 🗑
|
||||
| show | Red
🗑
|
||||
| show | demantoid
🗑
|
||||
| show | pyrope, spessartite, and almandite
🗑
|
||||
| The most important source of rhodolite in recent years is | show 🗑
|
||||
| Mandarin garnet has been used as a trade name for | show 🗑
|
||||
| Tsavorite is colored by | show 🗑
|
||||
| The most desirable, vibrant, and rare blue natural spinels are colored by | show 🗑
|
||||
| show | crystal structure
~All garnets belong to the cubic crystal system
🗑
|
||||
| The substitution of one chemical element for another in the crystal structure of a mineral is called | show 🗑
|
||||
| show | Chromium
🗑
|
||||
| show | Copper
🗑
|
||||
| show | Russia
🗑
|
||||
| A new turquoise treatment that appeared in the 1980s and has been used to treat more than 10 million carats is | show 🗑
|
||||
| show | Chilean
🗑
|
||||
| Reconstructed turquoise is | show 🗑
|
||||
| What is the color of the markings that sandstone matrix creates in turquoise? | show 🗑
|
||||
| Stabilized turquoise is a trade term for | show 🗑
|
||||
| The finest trade grade of lapis lazuli is | show 🗑
|
||||
| show | Copper
🗑
|
||||
| show | an even, intense medium blue
🗑
|
||||
| show | southwestern US
🗑
|
||||
| The major source for top-color turquoise today is | show 🗑
|
||||
| show | Afghanistan
🗑
|
||||
| show | limonite or sandstone
🗑
|
||||
| The trade term for top-color turquoise is | show 🗑
|
||||
| show | Blue
🗑
|
||||
| Kunzite’s most common color is | show 🗑
|
||||
| show | centipedes
🗑
|
||||
| Light-colored or colorless spodumene can be treated to a kunzite color by | show 🗑
|
||||
| An intense, unstable green color can be created in spodumene by | show 🗑
|
||||
| show | Two
🗑
|
||||
| show | orthoclase
🗑
|
||||
| show | Amazonite
🗑
|
||||
| Spectrolite is a variety of | show 🗑
|
||||
| What color is hiddenite? | show 🗑
|
||||
| show | natural
🗑
|
||||
| show | labradorite
🗑
|
||||
| Which of the following is a commercial source of chrome diopside? | show 🗑
|
||||
| show | Aluminum, oxygen, and silicon
🗑
|
||||
| show | Art Deco
🗑
|
||||
| Jet is an ornamental form of | show 🗑
|
||||
| show | Copal
🗑
|
||||
| Which animal’s tusk produces the most valuable ivory? | show 🗑
|
||||
| Amber is actually | show 🗑
|
||||
| show | San Benito County, California
🗑
|
||||
| show | Pink coral
🗑
|
||||
| show | abalone shell
🗑
|
||||
| show | Moldavite
🗑
|
||||
| show | Bleaching
🗑
|
||||
| show | Ivory
🗑
|
||||
| The amber color that’s most valuable is | show 🗑
|
||||
| show | England
🗑
|
||||
| Coral’s most valuable color is | show 🗑
|
||||
| Which of the following is a variety of conchiolin coral? | show 🗑
|
||||
| Tortoise shell is composed of | show 🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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