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.