Diamond Size Estimator: approximate full face-up dimensions for each cut and carat weight

To assist you in navigating the visual and dimensional characteristics of diamonds, we offer this comprehensive chart showing how carat weight generally reflects in stone measurements across different cuts.

This guide provides approximate face-up dimensions (in millimeters) for popular diamond shapes—Round, Cushion, Oval, Pear, Emerald, and Radiant—ranging from 0.25 to 5 carats. The dimensions are presented as Length × Width, offering an at-a-glance comparison of how size varies not just with weight, but with shape as well.

Important Note

These dimensions are approximations. In particular, elongated cuts like Radiant, Pear, Oval, and Emerald often vary significantly in proportions, affecting their face-up size and visual appeal. Every diamond is unique, and actual measurements are always stated precisely in its accompanying gemological certificate.