Unlock the secrets of your diamond's size! Our free online Diamond Weight Calculator is an essential tool for accurately estimating the carat weight of various diamond shapes, including round, princess, emerald, and more. Simply input the length, width, and depth (in millimeters) to get an instant calculation, helping you make informed decisions whether you're buying, selling, or assessing your precious stones.
Formula:
The general principle for estimating diamond weight is based on its volume and density. Each diamond shape has a specific formula using a shape-specific factor, often a variation of:
Weight (Carats) = Length (mm) × Width (mm) × Depth (mm) × Shape-Specific Factor
Common Shape Factors (Approximate):
- Round Brilliant: 0.0061
- Princess Cut: 0.0080
- Emerald/Radiant Cut: 0.0092
- Oval, Pear, Marquise, Heart Cut: 0.0060
- Asscher, Cushion Cut: 0.0080
Note: These are approximations for a typical diamond (specific gravity 3.52) and actual weight may vary slightly due to girdle thickness, cut variations, and other unique stone characteristics. For Round Brilliant, Length and Width are often treated as diameters for this calculation.