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shape and size may vary
or diameter of a bead
” taking its name from the stone
as well as some occurrences of dark gray
a stone which is indistinguishable from Jade except to the most trained and discerning eye
Black Spinel 4mm Faceted Coin - 15-16 Inch Stone Type_Australian Opal shape and size may varySpinel 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.
