Gemology

Gemology calculators for carat weight, diamond pricing, gem cut yield, refractive index, specific gravity, and faceting angles.

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Estimate gemstone carat weight from dimensions and specific gravity for mounted and unmounted stones.

Estimate diamond price per carat from the 4Cs: cut, clarity, color, and carat weight.

Calculate optimal crown and pavilion angles for different gem cuts based on refractive index.

Calculate diamond price adjustment for fluorescence grade relative to color grade.

Estimate expected polished gemstone weight from rough stone weight, shape, and target cut.

Calculate ROI from gemstone purchase price, appreciation rate, holding period, and transaction costs.

Calculate per-carat price for calibrated and uncalibrated gem parcels based on size, quality, and count.

Calculate price adjustment factors for treated vs untreated gemstones by treatment type and gem species.

Calculate specific gravity from hydrostatic weighing (weight in air and water) for gem identification.

Interpret RI measurement and birefringence for gemstone identification against a reference database.