Fantasia ring by Roberto Coin. 18-karat rose and white gold. Wavy, crisscross bands encrusted with pave white diamonds. 4. 99 total diamond carat weight. Approx. 19mm or 3/4" at widest. Domed top sits 1/2" off finger. Roberto Coin signature hidden 0. 3-carat ruby. Tapered band. Size 7.