Estate David Yurman Quatrefoil collection chalcedony with diamond halo sterling silver ring.ID:# RG691Chalcedony: One (1) bezel set, quatrefoil shaped sculped chalcedony measuring approximately 9.5 x 9.8mm.Diamonds: Twenty-two pav set diamonds.Metal: Sterling silverSize: 6Weight: 3.58gMarkings: 'DY', '7', '925'