This sterling silver ring mounting features a center 4-prong mounting that holds one 6.5mm (1-ct. approx.) round faceted stone. The ring is semi-mounted with 20 round CZs in shared-prong settings in double rows along the shoulders, and 21 round CZs set in the halo that encircles the center mounting. Cut a seat in the prongs to accommodate your stone, then burnish the prongs over the stone to secure it in place.