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GIA Colored Stones Assignment 19: Opal Questions and Answers 100% Correct $10.99   Add to cart

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

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GIA Colored Stones Assignment 19: Opal Questions and Answers 100% CorrectGIA Colored Stones Assignment 19: Opal Questions and Answers 100% CorrectGIA Colored Stones Assignment 19: Opal Questions and Answers 100% Correct silica spheres - ANSWER - Precious opal is made of billions of uniform submicr...

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  • September 4, 2024
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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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