Diamond Weight Estimator

All misc tools

Estimate diamond carat weight from measurements.

Measurements (mm)

Shape

Length / Dia 1

Width / Dia 2

Depth (Table to Culet)

Girdle Correction

Calculated Weight

Estimated Carats1.03ct

Formula Factor used0.00610

Formula: Dia² × Depth × Factor

About this calculator

Overview

Diamond weight can be estimated from dimensions (length, width, depth) and shape. Different shapes have different volume-to-weight ratios. Useful for identifying stones or verifying certificates.

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Pro Tips

Measure at widest and deepest points accurately.
Round brilliant factor: ~0.0061; Princess: ~0.0083.
Depth percentage affects weight estimation accuracy.
Certified diamonds have exact weight on report.

Fun Facts

"1 carat = 100 points (50 points = 0.50 carat)."
"Average engagement ring diamond: 1.0-1.2 carats."
"Diamond density: 3.52 g/cm³ (specific gravity)."
"Largest gem-quality diamond: Cullinan (3,106 carats)."

Formula: Carat = Length × Width × Depth × Shape Factor