GIA COLORED STONES ASSIGNMENT 19 QUESTIONS AND CORRECT SOLUTIONS 100%
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GIA Colored Stones
Institution
GIA Colored Stones
GIA COLORED STONES ASSIGNMENT 19 QUESTIONS AND
CORRECT SOLUTIONS 100%
silica spheres Precious opal is made of billions of uniform submicroscopic _________
___________, stacked in an orderly pattern.
light Play-of-color is produced by the interaction of _________ with opals internal structure ...
GIA COLORED STONES ASSIGNMENT 19 QUESTIONS AND
CORRECT SOLUTIONS 100%
silica spheres Precious opal is made of billions of uniform submicroscopic _________
___________, stacked in an orderly pattern.
light Play-of-color is produced by the interaction of _________ with opals internal structure of
stacked silica spheres.
black opal _________ _________ commands the highest prices of all opal types.
white opal _________ ________ makes of the bulk of commercial-quality opal on the market.
matrix backing ____________ ____________ often makes boulder opal more durable than other
types of opal.
red orange, red The most valuable fire opals usually display uniform ________-___________ to
bright _______ color.
fire opal _______ _______ is one of the few opal types that manufacturers cut as faceted
gemstones
thin Assembled opal makes it possible to make attractive finished gems from _______ opal
pieces.
vary widely Individual opals can ________ _________ in appearance and quality
color, pattern, clarity ____________, ____________, and ___________ combine to create an
opal's unique beauty. (CPC)
background color Opals are often divided into types based on ________________ _________.
spectrum The rarest play-of-color contains hues that range across the entire _____________.
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