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occuring 10
meaning that their facets were cut using industrial grade diamond
The two most popular classes of Australian Opal are Black Opal mined in Lightning Ridge and Fire Opal
improving concentration
Multi Spinel 1.5x2mm Faceted Rondelle AA Grade - 15-16 Inch missing occuring 10Spinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.
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