Diamond Exchange
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Price Calculator
Pick a shape, carat, color and clarity to see an instant price interpolated on the OpenFacet per-carat price matrix.
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Not investment advice. This page only describes the diamond price grid and index published by OpenFacet; it contains no predictions or recommendations.
- Prices are spot-market references; actual transactions vary by certification, cut quality, seller and market.
- Diamonds are not a standard commodity; each stone is unique and less liquid than gold or stocks.
- Data updates roughly once a day; displayed values reflect the latest snapshot.
Data source: OpenFacet (data.openfacet.net) — natural GIA-certified round diamond prices, open and key-free. Prices update roughly once a day and are UTC-timestamped. Actual sale prices vary by certification, cut quality, seller and market.
Related Pages
Frequently Asked Questions
- What is the DCX (Diamond Composite Index)?
- The DCX is the average USD price per carat of a representative basket of actively traded natural diamonds. It is computed by OpenFacet and updates roughly once a day.
- Why does a diamond price change by carat, color and clarity?
- The 4Cs (carat, color, clarity, cut) are the core attributes that set a stone’s price. OpenFacet publishes the per-carat price in a color × clarity matrix for each carat band; intermediate carat values are found via log-linear interpolation.
- How are fancy shapes (oval, pear, emerald) priced?
- Fancy shapes are priced with a length/width (L/W) ratio multiplier applied to the round base price. Cushion cut uses a separate base matrix. The ratio models come from OpenFacet ratio_models data.