Ad Space
Other Calculators
Diamond Carat Weight Estimator
Estimate the carat weight of a round brilliant-cut diamond from its diameter and depth in millimeters.
Estimated carat weight
—
Ad Space — 300×250
About the Diamond Carat Weight Estimator
For round brilliant-cut diamonds, jewelers use a well-known estimation formula based on the stone's average girdle diameter and total depth, both measured in millimeters with calipers.
Formula: Estimated Carat Weight ≈ Diameter² × Depth × 0.0061
This is only an approximation — actual weight also depends on cut proportions and density variations, so a certified gemological scale or lab report is needed for precise, appraisal-grade weight.
Ad Space