Gemstone Weight Calculator
Instantly estimate gemstone carat weight online
Gemstone Weight Calculator launched on August 23, 2025 with 7 votes, #3,174 of 8,530 launches that month. The site was still online in September 2026, 1 year on.
What it does
Free online tool to instantly estimate gemstone carat weight from dimensions. Supports sapphire, emerald, ruby & more. Built by Desiree Gems, mobile-friendly, easy to use, and shareable across websites & blogs.
Estimate gemstone carat weight online using our free calculator. Enter dimensions to get instant results. Powered by Desiree Gems.
Limited Time Offer! Use Code DESIREE20 upon checkouts for 20% OFF and Free Shipping Search Log in Cart Item added to your cart View cart Check out Continue shopping Gemstone Weight Calculator This free gemstone weight calculator helps you estimate the carat weight of sapphires, emeralds, rubies, and more. Jewellers, collectors, and gem enthusiasts worldwide use this tool to quickly approximate gemstone weight. Formulae used: • Brilliant family (round/oval/pear/marquise/most cushions): ct ≈ L × W × D × K , where K ≈ 0.0061 for diamond and scales by SG/3.52 for other gems. • Step family (emerald/princess/asscher/radiant): ct ≈ L × W × D × (0.00270 × SG) , then apply optional Weight Correction…from desireegems.com
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