This deep black acid-washed glass holds out the promise of much richness, for peaking through are veins of gold. It looks as if you scraped the black away you would have a solid gold clasp. But, alas, it is only a piece of vintage Czech glass. It is nice to dream though....The cabochon is set in a sterling silver box clasp. The centerpiece is 19 mm by 26 mm. The clasp is 38 mm from ring to ring. Available with one ring or three rings, please specify.