EXCLUSIVELY AT NEIMAN MARCUS Letter ring by Roberto Coin. Tapered 18-karat white gold band. I, J, and L; 0. 03 total diamond carat weight. K, T, and Y; 0. 04 total diamond carat weight. C, F, P, S, V, X, and Z; 0. 05 total diamond carat weight. A, B, D, E, G, H, O, R, and U; 0. 06 total diamond carat weight. N and Q; 0. 07 total diamond carat weight. M and W; 0. 08 total diamond carat weight. Roberto Coin signature hidden synthetic ruby. Ring size, 6. 5 (all). Made in Italy.