GIA Colored Stones Final Exam Latest Update 2024-2025 Actual Exam 600+ Questions and 100% Verified Correct Answers Already Graded A+ Verified by Professor
"Inky" sapphires generally originate from... - CORRECT ANSWER: Australia
"Thai" sapphires are ______ to ______ in color and often described as ______ or
_______. - CORRECT ANSWER: Violetish blue to slightly greenish blue
Inky blue or blue-black
11. The color change in alexandrite is caused by - CORRECT ANSWER: Slight
impurities in Chromium
14. The hydrothermal synthetic process requires a - CORRECT ANSWER: Pressurized
steel container and crushed chemical ingredients.
- countries that account for 75% of emerald purchases worldwide - CORRECT
ANSWER: US and Japan
2 methods used to synthesize emeralds - CORRECT ANSWER: 1. Flux
- Hydrothermal
2 through 8 - CORRECT ANSWER:
21. Pearls-Hank - CORRECT ANSWER: A number of similar cultured pearl strands
bundled together
- treatments used with lapis - CORRECT ANSWER: 1. dyed 1 / 4
- impregnated with wax or plastic
- heated then dyed
- The type of matrix found as a layer in finished boulder opal is - CORRECT ANSWER:
Ironstone
A Burmese sapphire's blue is known as ______ blue and is considered somewhat
_______. - CORRECT ANSWER: Royal; inky
A characteristic or irregularity confined to the surface of a polished gemstone is a(n) -
CORRECT ANSWER: Blemish
A common sapphire characteristic - CORRECT ANSWER: Color zoning
A cryptocrystalline quartz aggregate - CORRECT ANSWER: Chalcedony
A crystal growth habit with bumpy appearance
(similar to a bunch of grapes) - CORRECT ANSWER: Botryodal
A gem produced by, or derived from, a living organism is - CORRECT ANSWER:
Organic.
A Kashmir sapphire's blue is also known as - CORRECT ANSWER: Cornflower blue
A laboratory-created gem with essentially the same chemical composition, crystal
structure, and properties as its natural counterpart is a(n) - CORRECT ANSWER:
Synthetic.
A large - CORRECT ANSWER: unhealed feather
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A new turquoise treatment that appeared in the 1980s and has been used to treat 10
million+ cts - CORRECT ANSWER: Zachary method
A property of some xtls that causes them to vibrate at a constant frequency when
subjected to an electrical current - CORRECT ANSWER: Piezolectricity
A smokey corundum that turns blue when treated - CORRECT ANSWER: Dhun
A snakeskin structural pattern is typical of - CORRECT ANSWER: Synthetic opal.
A substance that consists of atoms of only one kind - CORRECT ANSWER: Chemical
element
A table-cut gem with a flat or slightly domed top and sometimes a carved design,
typically set in men's rings and cufflinks - CORRECT ANSWER: Signet
A transparent quartz, usually rock xtl, that contains eye-visible inclusions, often named
according to the type of inclusions it contains - CORRECT ANSWER: Sagenitic
A two-phase inclusion is a cavity in a gem that's typically filled with - CORRECT
ANSWER: A liquid and a gas.
A type of sagenitic quartz containing ndl-like rutile inclusions - CORRECT ANSWER: Rutilated quartz
A type of sagentic quartz contaiing ndl-like or rod-like tourmaline inclusions - CORRECT
ANSWER: Tourmalated quartz
A unit cell defines a mineral's - CORRECT ANSWER: Basic identity.
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Absorption spectrum. - CORRECT ANSWER: The pattern of dark lines or bands shown
by certain colored gems when viewed through a spectroscope.
Adularescence is caused by - CORRECT ANSWER: scattering of light
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
Amazonite is an imitation of what stone? - CORRECT ANSWER: Turquoise
Are Spinels a good substitute for Tanzanite? - CORRECT ANSWER: No, Spinels are
singly refractive; they don't show doubly, they can't show pleocroism.
Assignment 10 - CORRECT ANSWER:
Assignment 11 - CORRECT ANSWER:
Assignment 12 - CORRECT ANSWER:
Assignment 13 - CORRECT ANSWER:
Assignment 14 - CORRECT ANSWER:
Assignment 15 - CORRECT ANSWER:
Assignment 16 - CORRECT ANSWER:
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