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limestone and copper
Zoisite occurs as prismatic
Cubic Zirconia can be truly colorless
Ametrine is quartz that occurs in bands of purple and yellow
Multi Spinel 3mm Faceted Round AA Grade - 15-16 Inch 60-90mm limestone and copperSpinel 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.
