Black Spinel 4mm Faceted Coin - 15-16 Inch Stone Type_Australian Opal as well as some occurrences

as well as some occurrences of dark gray

or diameter of a bead

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

shape and size may vary

approximately 168 beads

Black Spinel 4mm Faceted Coin - 15-16 Inch Stone Type_Australian Opal as well as some occurrencesSpinel 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.