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Aquamarine is a transparent to translucent stone ranging from cerulean blue to light blue in higher grades
known as "azure
Mohs hardness 7
abbreviated as CZ
Amethyst has long been associated with February
Black Spinel 4mm Natural Round - 15-16 Inch 1207202148HR Aquamarine is a transparent toSpinel 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.
