Sapphire clasp

It looks like an engraved stone, but it is really glass. The pattern is not as delicate as filigree. The carving reminds me of stone carving in a Medieval church. The vintage centerpiece is from West Germany. It is 20 mm round. The clasp is 32 mm from ring to ring. The centerpiece is set in a hand-made sterling silver box clasp. Available with one ring or two rings, please specify.