10mm Ruby Red Spinel in Biotite Plain Coin Beads 18 inch 47 pieces

10mm Ruby Red Spinel in Biotite plain coin beads have a vitreous luster on a smooth surface showing a fairly symmetrical shape of consistent quality. These dark bodied beads show internal features of natural Red Spinel that looks like corundum within grey and black Biotite which is in the Mica group.
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