Black Spinel 4mm Faceted Coin - 15-16 Inch Stone Type_Australian Opal a stone which is indistinguishable

a stone which is indistinguishable from Jade except to the most trained and discerning eye

” the other being Nephrite

which receive their color from trace amounts of chromium

Each strand is unique

Black Spinel 4mm Faceted Coin - 15-16 Inch Stone Type_Australian Opal a stone which is indistinguishableSpinel 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.