GIA Final exam colored stones Latest Update

GIA Final exam colored stones Latest Update

• 200+ Questions and

100% Verified Correct Answers Already Graded A+ Verified by Professor

"Marabá" amethyst is often - CORRECT ANSWER: less saturated in color than amethyst from other sources but color is uniform

A broad gem category based on chemical composition and crystal structure is a -

CORRECT ANSWER: gem species.

A carved design that projects slightly from a flat or curved surface is called a(n) -

CORRECT ANSWER: cameo

a cylindrical synthetic crystal produced by a melt process - CORRECT ANSWER: Boule

a distinct change in gem color under different types of lighting, color change most

common gems - CORRECT ANSWER: alexandrite

A gem colored by an element that's part of its basic chemistry is called - CORRECT

ANSWER: idiochromatic

a gem colored by trace elements in its crystal structure - CORRECT ANSWER:

allochromatic

a gemstone ability to tolerate the effects of light,changes in temperature or the action of

chemicals - CORRECT ANSWER: stability

a gemstone ability to withstand wear,heat and chemicals - CORRECT ANSWER:

durability 1 / 3

a gemstone resistance to breaking and chipping - CORRECT ANSWER: toughness

a gemstone resistance to scratches and abrasions,directly related to the strenght of the

chemicals bonds between its atoms - CORRECT ANSWER: hardness

A major source of black star sapphire is - CORRECT ANSWER: thailand

A metric carat equals - CORRECT ANSWER: 0.20 gram.

A natural, inorganic substance with a characteristic chemical composition and usually

characteristic crystal structure is a(n) - CORRECT ANSWER: mineral

a pattern of dark vertical lines or bands shown by certain gema when viewed through a

spectroscope - CORRECT ANSWER: absortion spectrum

A procedure that includes cleaning, buffing, and sometimes bleaching, done to make

cultured pearls presentable and appealing, is called - CORRECT ANSWER: Process

A quantity of stones of similar or mixed qualities, from a single mine or from various

sources, offered for sale together is called a - CORRECT ANSWER: parcel

A rainbow effect created when light is broken up into spectral hues by thin layers is -

CORRECT ANSWER: iridescense

a small defect in the crystal structure of a material that can absorb light and give rise to

a color - CORRECT ANSWER: color center

A snakeskin structural pattern is typical of - CORRECT ANSWER: synthetic opal.

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A special kind of interference phenomenon that produces patches of pure spectral

colors - CORRECT ANSWER: difraction

A substance that consists of atoms of only one kind is a - CORRECT ANSWER:

Chemicals element

A treatment that makes turquoise less porous without the use of polymers and improves

its ability to take a good polish is - CORRECT ANSWER: the Zachery method

A unit cell defines a mineral's - CORRECT ANSWER: basic identity.

Adularescence is caused by - CORRECT ANSWER: scattering of light

After irradiation, which gem's color is stable under normal wearing conditions? -

CORRECT ANSWER: Golden beryl

All garnets have essentially the same - CORRECT ANSWER: crystal structure

An angular, hollow space that resembles a mineral inclusion is called a - CORRECT

ANSWER: negative crystal

Aragonite is a crystallized form of - CORRECT ANSWER: calcium carbonate

Asterism in black star sapphire is caused by - CORRECT ANSWER: Hematite

Australian sapphire's blue color is often described as - CORRECT ANSWER: inky

Blue sapphire's most common crystal habit is a(n) - CORRECT ANSWER: spindle-

shaped hexagonal pyramid or bipyramid

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