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