The Riviera features sleek lines, and an exceptional high polish finish, with a 1 1/4 carat center, pictured. This is designed to hold a center from a light one carat up to a 1 1/2 carat. The top is about 4mm wide and the bottom shank is 3mm. The shank is comfort fit, extremely smooth finish. Look closely for the subtle details in this new classic reminiscent of the Tiffany Lucida, or the Michael Bondanza Madison.