What is the millimeter size of a 1 carat Round Cut Diamond? Use our diamond size chart to predict the carat weight by the mm diameter of a round diamond. Use our diamond size chart to understand the millimeter (mm) size of each diamond shape. . Shop round Diamonds. Round MM Size, Round Carat Weight . The millimeter tells you the true size of the diamond. With our diamond carat charts you can understand the millimeter differences between round and fancy . Click on the the cut to view its millimeter to carat conversion chart. Round; Princess; Asscher; Marquise; Radiant; Cushion . Round Cut. MM Size, Carat Weight . Round Diamond Size Chart . Printable Carat Weight to MM Chart: Here's a free diamond sizing chart that you can download and print out for your convenience. Our diamond size charts help you visualize the difference between shapes. . diamonds often appear larger than they are, they're cheaper than round too. Round Diamond Chart. Size (mm). Sieve #. Weight. Size (mm). Sieve #. Weight. 0.80 mm. +0000. 0.0035 ct. 2.2 mm. +8.50. 0.0464 ct. 0.90 mm. +000. 0.0040 ct. The millimeter tells you the true size of the diamond. With our diamond carat charts you can understand the millimeter differences between round and fancy . 19 de abr de 2017 - 4.0mm diameter, 5.1mm diameter, 5.8mm diameter, 6.4mm diameter. 1.25 ct, 1.5 . *Sizing is based on averages for a brilliant round diamond.