Traditional Venetian clasp

When my husband and I went on our honeymoon to Florence and Venice, I already owned a bead store, so you will not be surprised to know that we spent an entire day on the Island of Murano looking for loose beads. We didn't find any. Necklaces galore and I almost bought a chandelier, but no loose beads. So, being thus thwarted, I have spent time collecting old ones wherever I find them. This example is a typical pattern for what could become a very non-typical necklace. Venetian glass is too pretty not to give it its own matching clasp, and here it is. The centerpiece is 22 mm and the clasp is 36 mm from ring to ring. The vintage centerpiece is set in a sterling silver box clasp. Available only with two rings or three rings, please specify.