Exam (elaborations)
GIA COLORED STONES FINAL QUESTIONS AND ANSWERS
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GIA COLORED STONES FINAL QUESTIONS AND ANSWERS
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Name: Score:278 Multiple choice questions
Definition 1 of 278
type of tektite. glassy nodules. They form when meteorites struck earth, altered surface rock
with heat and splashed it near and far in molten form. This may have come from
Czechoslovakia (Moravia) from a mmeteor in Germany 15 million years ago. Other people think
it came from volcanic eruptions in the crater Tycho on the moon and to earth 14 million years
ago.
Hiddenite
Rhodolite
Moldavite
Hessonite
Definition 2 of 278
Asia perfected an undisclosed copper diffusion treatment for pale andesine feldspar. make
vivid red and green hues, like natural sunstone. andesine treatment disclosed in 2008.
Imperial Topaz
1980 most quantity produced Ruby
Benitoite
undisclosed copper diffusion treatment for pale andesine feldspar
Definition 3 of 278
All feldspar contain aluminium, oxygen and silicon, but potassium calcium and sodium can be
major components. Differing amount of latter 3 lead to wide variety.
Adularescence
Arizona Amethyst
Feldspar elements
Varities of coral
,Definition 4 of 278
Myanmar: Mogok and Mong Hsu. Mogok mining is 2150m above. Covers 175km squared. 90%
ruby, 10% sapphire. Marble hosted, landscape filled with marble pinnacles called karsts.
Weathering processes that formed them blackened their surfaces and also transported marble
and ruby into gem gravels called byon. Alluvial, eluvial and hard rock operations. They use jigs
to seperate minerals and corundum.
Pink and Purple Sapph
Myanmar Ruby Information
Fresh Water Pearls
Coating Pearls
Definition 5 of 278
To grow coral, water must be calm, within temperature range, free of pollutants and
suspended mud. Calcareous and conchiolin both are skeletal remains of tine marine animal
colonie
Coral
Pyrite
Geuda
Moldavite
Definition 6 of 278
Zambian Copperbelt Province. Emerald miining takes place in restricted zone called Ndola
Rural Emerald Restricted Area. Kagem is best mine in Zambia. Gemfields owns 75%, Zambian
Government 25%. Open pit mining. Kilometer in length. 20% of all worlds emeralds. Strip and
fill process, digs highwall and deposists and footwall. Explosives to push back highwall, hand
tools to extract exposed emeralds from schist. They are placed in lockboxes. India cuts most
Zambian emeralds.
Thailand Sapph Info
Synthetic Emerald Info
Zambia Emerald Info
Sandwana Emeralds
,Definition 7 of 278
Biggest source of fire opals. Fire opals have randomly arranged silica platelets. Sourced from
central Mexico's volcanic fields. Queretaro and Magdalena are two sources 1870.
Sandawana Emeralds
Sodalite
Mexico Opals
Sapphire Compliment
Definition 8 of 278
SS and tahitian treatment. Removes the outer layer of nacre, this uncovers bad layers.
Pyrite
Buffing Pearls
Peeling Pearls
Malachite
Definition 9 of 278
Unakite is AGG of quartz, pink feldspar and green epidote. found in North Carolina Unaka
range.
Pyrite
Sodalite
Unakite
Sugilite
, Definition 10 of 278
shell of the atlantic hawksbill sea turtle.
Aquamarine treatment
Orange garnets
Tourmaline groups
Tortoise shell
Definition 11 of 278
Lazurite makes the royal blue color, afghanite makes it pale blue
China Biggest Market
minor sources for tsavorite
Topaz Color Causing
Color causing lapis
Definition 12 of 278
Almandine contains iron, pyrope contains magnesium.
Almandine and Pyrope
Sources of Zircon
Best Peridot Source
Kunzite
Definition 13 of 278
600-650 celcius, turns into uniform blue. This is due to change in valence state of vanadium.
Tanzania Ruby Information
Tanzanite Heating
Spinel Color
Sodalite
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