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GIA Colored Stones Exam Questions and Answers 100% Solved
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GIA Colored Stones Exam Questions and Answers 100% Solved Mineral - A natural, inorganic substance with a characteristic chemical composition and usually characteristic structure. Mixed cut - A cutting style that combines brilliant-cut and step cut facets. Abrasions - Tiny nicks and pits caus...

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  • October 4, 2024
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  • 2024/2025
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GIA Colored Stones Exam Questions

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Mineral - ✔✔A natural, inorganic substance with a characteristic

chemical composition and usually characteristic structure.

Mixed cut - ✔✔A cutting style that combines brilliant-cut and step cut

facets.

Abrasions - ✔✔Tiny nicks and pits caused by wear and damage to a

gem's facet edges or culet.

Absorption spectrum - ✔✔A pattern of dark vertical lines or bands shown

by certain gems when viewed through a spectroscope.

Adularescence - ✔✔The cloudy bluish white light in a moonstone,

caused by scattering of light.

Agate - ✔✔Chalcedony with a curved or angular bands or layers that

differ in color and transparency .

Aggregate - ✔✔A mass of tiny, randomly oriented crystals.

,Akoya - ✔✔Common name for the Pinctada fucata oyster and the

natural or cultured pearls it produces.

Allochromatic - ✔✔A gem colored by trace elements in its crystal

structure.

Alluvial deposit - ✔✔A deposit where gems are eroded from their source

rock, then transported away from their source and further concentrated.

Amorphous - ✔✔Lacking a regular crystal structure.

Aragonite - ✔✔A crystalized form of calcium carbonate found in nacre.

Assembled stone - ✔✔Two or more separate pieces of material joined to

form a unit.

Asterism - ✔✔Crossing of chatoyant bands, creating a star in the dome

of cabochon.

Atom - ✔✔The basic structural unit of all matter.

Aventurescence - ✔✔A glittery effect caused by light reflecting from

small, flat inclusions within a gemstone.

Background color - ✔✔An opal's bodycolor, independent of its play-of-

color.

,Bead nucleus - ✔✔A bead used as the core of a cultured pearl, usually

made from a freshwater mussel shell.

Bleaching - ✔✔A treatment that uses chemicals to lighten or remove

color.

Blemish - ✔✔Characteristic or irregularity confined to the surface of a

polished gemstone.

Blue Sheen - ✔✔Trade term for a highly prized, vivid blue adularescence

displayed by the finest moonstone.

Bodycolor - ✔✔A gemstone's basic color, determined by its selective

absorption of light.

Botryoidal - ✔✔A crystal growth habit with a bumpy appearance similar

to a bunch of grapes.

Boulder opal - ✔✔Thin layers of precious opal, cut to include matrix.

Boule - ✔✔A cylindrical synthetic crystal produced by the flame-fusion

process.

Brilliance - ✔✔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.

, Brilliant cut - ✔✔Cutting style with triangular or kite-shaped facets that

radiate from the center toward girdle.

Cabochon - ✔✔A smoothly rounded polished gem with a domed top and

a flat or curved base.

Calcareous concretion - ✔✔A non-nacreous natural "pearl".

Calibrated sizes - ✔✔Gemstone sizes cut to fit standard mountings.

Cameo - ✔✔A gem carving style in which the design often a women's

profile, projects slightly from a flat or curved surface.

Cavity - ✔✔An opening that extends into a gem from the surface.

Centipedes - ✔✔Tiny tension cracks in a moonstone that interfere with

adularescence and reduce value.

Ceramic process - ✔✔A process in which ground powder is heated,

sometimes under pressure, to produce a fine-grained solid material.

Certificate of origin - ✔✔A document that indicates a stone's geographic

origin, based on its inclusions and trace element chemistry.

Chalcedony - ✔✔A cryptocrystalline quartz aggregate.

Charge transfer - ✔✔A process where the electrons that selectively

absorb light are passed back and forth between neighboring impurity ions.

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