This clasp size is 16 x 21 plus the loops. This one is a single strand. Notice that we did some spin photography so you can see the filigree backside Beautiful! The cabochon set in this sterling clasp is vintage West German turquoise glass infused with colorful metallic flecks. What a beauty! The cabochons were found in a basement of a business in NYC that is no longer there. A little bead history goes a long way sometimes.