Exam (elaborations)
2024 GIA Colored Stones Assignment 19: Opal Questions And Answers With Verified Study Solutions
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Precious opal is made of billions of uniform submicroscopic _________ ___________, stacked in an orderly pattern. - Answer-silica spheres Play-of-color is produced by the interaction of _________ with opals internal structure of stacked silica spheres. - Answer-light _________ _________ command...
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