Mystic Black Spinel faceted rondelles measure approximately 7-8mm diameter in size, gemstones have a metallic luster showing good polish, gemstones are a symmetrical rondelle shape, these Black Spinel beads are Opaque in an extremely brilliant body, gems are a Peacock hued metallic Black Spinel bead which has been treated with a Mystic coating for a shimmering group of rondelles.