Category Gemstone Calculators – Carat, Size & Jewelry Tools

Gemstone Calculators for Carats, Dimensions, Pricing & Jewelry Measurement

Explore tools for gemstone weight, carat conversion, pricing, dimensions, diamond proportions, jewelry sizing and metaphysical stone calculations with instant results.

Explore Our Gemstone Calculators

This category offers a complete suite of gemstone and jewelry calculators designed for jewelers, gemologists, appraisers, collectors, investors and crystal enthusiasts. From converting carats to grams and estimating gemstone weight to calculating diamond proportions, evaluating stone density and estimating jewelry costs — these tools deliver fast, accurate and gemology-driven results.

Whether you work with diamonds, rubies, sapphires, emeralds, tourmalines or metaphysical crystals, each calculator helps you analyze gemstone qualities, size, carat weight, price and jewelry dimensions with professional precision.

Carat to Gram Converter
Convert carats to grams instantly with accurate weight formulas.
MM to Carat Conversion Calculator
Convert millimeter measurements to estimated carat weight by shape.
Gemstone Weight Calculator
Estimate gemstone weight from dimensions, shape, and specific gravity.
Diamond Carat Weight Calculator
Estimate diamond carat weight from measurements and cut style.
Cabochon Weight Calculator
Estimate cabochon weight from dimensions and material density.
Gemstone Specific Gravity Calculator
Calculate gemstone specific gravity to support weight and ID checks.
Gemstone Price Calculator
Estimate gemstone price from carat, quality factors, and rate.
Diamond Price Calculator
Estimate diamond price using carat, cut, color, and clarity.
Moissanite vs Diamond Price Calculator
Compare costs and savings between moissanite and diamond options.
Diamond Resale Value Calculator
Estimate diamond resale value after fees and market adjustments.
Gemstone Resale Value Calculator
Estimate gemstone resale value after fees and market adjustments.
Emerald Price Calculator
Estimate emerald price by carat, origin, clarity, and color.
Ruby Price Calculator
Estimate ruby price by carat, color, treatment, and clarity.
Sapphire Price Calculator
Estimate sapphire price by carat, color, origin, and clarity.
Engagement Ring Budget Calculator
Estimate engagement ring budget using income, savings, and goals.
Ring Size Converter
Convert ring sizes between US, UK, EU and diameter/circumference.
Gold Weight Calculator
Calculate gold weight from dimensions, purity, and density.
Gold Price Calculator
Estimate gold price from weight, karat, spot price, and premiums.
Scrap Gold Calculator
Estimate scrap gold value from weight, karat, and spot price.
Silver Price Calculator
Estimate silver price from weight, purity, and spot price.
Diamond Table Percentage Calculator
Calculate diamond table percentage from measurements quickly.
Diamond Depth Percentage Calculator
Calculate diamond depth percentage from depth and diameter.
Diamond Cut Proportions Calculator
Estimate cut grade proportions using table, depth, and angles.
Birthstone Finder Calculator
Find your birthstone by month with traditional and modern options.
Zodiac Gemstone Calculator
Match zodiac signs to gemstones using traditional associations.
Chakra Stone Calculator
Explore chakra stones by chakra and common crystal pairings.
Crystal Compatibility Calculator
Check crystal compatibility by pairing intent, signs, and stones.
Crystal Grid Calculator
Plan crystal grid layouts by intention and stone choices.