More Details Roberto Coin cuff bracelet from the Bollicine Collection. 18-karat yellow gold tapered, open frame. Rope-motif borders and mixed circle stations. Prong-set round white diamond accents. 0.1 total diamond carat weight. Signature hidden synthetic ruby. Approx. 2.5" diam.; 1.1"W. Split back eases dress. Slip-on style. Made in Italy.