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known as "azure
Since gemstones (natural
Red Garnet is the most commonly known type of Garnet
Mohs hardness 7
Black Spinel 4mm Natural Round - 15-16 Inch 1207202148HR known as "azureSpinel 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.
