Mystic or Metallic Black Spinel faceted rondelles have a metallic luster due to the Silver Titanium plating which is a stable process bonding to the gem itself rather than a mere coating. The cut and polish are of excellent quality producing a symmetrical rondelle for these Black Spinel beads of an opaque translucency showing no internal characteristics, and the metallic coating adds an even higher level of sparkle to resemble a `black diamond-like` gemstone. AAA One of our all-time favorite beads!!