Gemstone estimate tool
Gemstone Weight Calculator
Select a gemstone, choose the matching stone shape, enter the measurements, and calculate an estimated carat weight.
Could not load the calculator assets. Keep this HTML file in the same folder as gemstone_weight_calculator_data.json, gemstone_shape_map.json, and gemstone_shapes.css, then open it through a local server such as
python3 -m http.server 8000.
Step 1
Select gemstone or material
The calculator uses the selected stone’s specific gravity. You can also override it manually.
Step 4
Estimated carat weight
The result appears here after calculation.
Reveal your estimate
Demo funnel: collect an email first or allow the user to skip.
Need a professional appraisal or gemstone verification?
JAGI Lab provides professional jewelry appraisals, gemstone identification, insurance appraisals, estate evaluations, authentication services, and trade-grade gemology support.
Formula will appear after a shape is selected.