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It is an aluminum borosilicate mixed with iron
Tiger Iron has long been popular with jewelry-makers
but occasionally gabbro comes in oranges and greens
Great for gift giving or get one for yourself
the third to hardest common natural gemstone
Black Spinel 4x8mm Faceted Rondelle - 15-16 Inch R0305 It is an aluminum borosilicateSpinel 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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