Exam (elaborations)
GIA Colored Stones Assignment 19 Opal(44 questions and answers)
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GIA Colored Stones Assignment 19 Opal(44 questions and answers)
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GIA Colored StonesAssignment 19: Opal(44
questions and answers)
silica spheres - answer Precious opal is made of
billions of uniform submicroscopic _________
___________, stacked in an orderly pattern.
light - answer Play-of-color is produced by the
interaction of _________ with opals internal structure
of stacked silica spheres.
black opal - answer _________ _________ commands
the highest prices of all opal types.
white opal - answer _________ ________ makes of the
bulk of commercial-quality opal on the market.
matrix backing - answer ____________ ____________
often makes boulder opal more durable than other
types of opal.
red orange, red - answer The most valuable fire
opals usually display uniform ________-___________ to
bright _______ color.
, fire opal - answer _______ _______ is one of the few
opal types that manufacturers cut as faceted
gemstones
thin - answer Assembled opal makes it possible to
make attractive finished gems from _______ opal
pieces.
vary widely - answer Individual opals can ________
_________ in appearance and quality
color, pattern, clarity - answer ____________,
____________, and ___________ combine to create an
opal's unique beauty. (CPC)
background color - answer Opals are often
divided into types based on ________________ _________.
spectrum - answer The rarest play-of-color
contains hues that range across the entire
_____________.
red - answer _____ is often considered the most
desirable play-of-color.
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