Round brilliant cut 3 carats and up with 1 carat on either side. I really like the 3 stone rings. Judging from these posts, most ladies prefer anywhere b/t 2.5 - 8 (teehee, Noriko!) As gals, we all know that with diamonds, the bigger the bettter! So this is really funny b/c I was talking to one of my guy friends about diamonds the other day and he was like, "Oh, 1 carat seems pretty big to me already". Sigh... I pity his future wife.