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GIA Colored Stones EXAM | 687 Questions Solved 100% Correct| Verified Answers
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GIA Colored Stones EXAM | 687 Questions Solved100% Correct| Verified Answers
Light that eventually returns to the eye after entering a gem through the crown, reflecting
off its pavilion facets, and exiting back through the crown. - ANSWER Brilliance
Cutting style with triangular or kite-shaped facets that radiate from the center toward girdle.
- ANSWER Brilliant cut
A smoothly rounded polished gem with a domed top and a flat or curved base. - ANSWER
Cabochon
A non-nacreous natural "pearl". - ANSWER Calcareous concretion
Gemstone sizes cut to fit standard mountings. - ANSWER Calibrated sizes
A gem carving style in which the design often a women's profile, projects slightly from a flat
or curved surface. - ANSWER Cameo
An opening that extends into a gem from the surface. - ANSWER Cavity
Tiny tension cracks in a moonstone that interfere with adularescence and reduce value. -
ANSWER Centipedes
,A process in which ground powder is heated, sometimes under pressure, to produce a fine-
grained solid material. - ANSWER Ceramic process
A document that indicates a stone's geographic origin, based on its inclusions and trace
element chemistry. - ANSWER Certificate of origin
A cryptocrystalline quartz aggregate. - ANSWER Chalcedony
A process where the electrons that selectively absorb light are passed back and forth between
neighboring impurity ions. - ANSWER Charge transfer
Bands of light in certain gems, caused by reflection of light from many parallel, needle-like
inclusions or hollow tubes. - ANSWER Chatoyancy
Kinds and relative quantities of atoms that make up a material. - ANSWER Chemical
composition
A substance that consists of atoms of only one kind. - ANSWER Chemical element
A damaged area on a gem, usually near the girdle. - ANSWER Chip
Trade term for a vibrant green tourmaline that's colored by traces of vanadium, chromium,
or both. - ANSWER Chrome tourmaline
A pearl with one or more grooved or ridged rings all the way around it. - ANSWER Circled pearl
A smooth, flat break in a gemstone parallel to planes of atomic weakness, caused by weak
or fewer bonds between atoms or both. - ANSWER Cleavage
,Any hazy or milky area that cannot be described as a feather, fingerprint, or group of
included crystals or needles. - ANSWER Cloud
Removing heavily included sections from a gemstone rough by carefully tapping it with a small
hammer. - ANSWER Cobbing
A small defect in the atomic structure of a material that absorb light and give rise to a color. -
ANSWER Color center
A distinct change in gem color under different types of lighting. - ANSWER Color Change
The selection of colors in which a gemstone occurs. - ANSWER Color range
Areas of different color in a gem, caused by variations in growth conditions. - ANSWER Color
zoning
Filling of pores or other openings with melted wax, resin, polymer, or plastic to
improve appearance and stability. - ANSWER Colorless impregnation
Market sector where average-quality gemstones are used in mass-market jewelry. - ANSWER
Commercial market
The organic "glue" in nacre that holds aragonite platelets together. - ANSWER Conchiolin
A curved and ridged fracture in a gemstone, extending from the surface inward. -
ANSWER Conchoidal fracture
A selection of goods loaned to a dealer by another wholesaler or gem cutter. - ANSWER
Consignment
, Localized changes caused by an igneous intrusion that takes place where the magma meets the
surrounding rock. New minerals may form due to temperature changes or introduction of
fluids from the magma. - ANSWER Contact metamorphism
The earth's innermost layer. - ANSWER Core
The network of tiny fractures that develop when opal loses moisture. - ANSWER Crazing
Top part of the gem above the girdle. - ANSWER Crown
The relationship of the height of a gem's crown to the depth of its pavilion, judged by
viewing its profile, - ANSWER Crown-height to pavilion-depth ratio
The surface and outermost later of the earth. - ANSWER Crust
An aggregate made up of individual crystals detectable only under very high magnification. -
ANSWER Cryptocystalline
Regular, repeating internal arrangement of atoms in a material. - ANSWER Crystal structure
A cultured pearl grown around a nucleus glued under the mantle tissue inside a mollusk's
shell. - ANSWER Cultured blister pearl
A pearl formed as the result of human intervention in the formation process. - ANSWER
Cultured pearl
A unique piece designed and created for a particular customer, often around specially
chosen stones. - ANSWER Custom-made jewelry
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