ART DECO PLATINUM DIAMOND & ONYX PIN: Platinum Art Deco diamond and onyx pin centers one old mine cut diamond and 20 round rose cut diamonds, all totaling approx. 1.00 Ct., rated VS in clarity and H-I in color. The onyx is an octagonal sugarloaf cut piece. The diamonds are bezel and bead set. Bar pin closure. Length: 2''. Weight: 5.5 grams.