GIA Colored Stones Assignment
19: Opal Questions and
Answers 100% Correct
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
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