A market-wide average across qualities and sizes. Your stone's value depends on carat, color, clarity, cut, treatment, and origin.
Diamonds are renowned for their exceptional hardness and brilliance, formed deep within the Earth's mantle under high pressure and temperature. They are typically colorless but can exhibit a range of hues, with popular cuts including round, princess, and emerald.
Market averages will not price your stone. GemstoneAI identifies gems and jewelry from a photo, checks authenticity and treatment signals, and gives you a real market valuation in seconds. Free to try.
The GemstoneAI market index for diamond is $4,476 per carat as of 2026-08-04. That is a market-wide average across qualities, not a quote for a specific stone. Individual value depends on carat, color, clarity, cut, treatment, and origin.
Visual tests alone are unreliable. GemstoneAI analyzes a photo of your stone for identity, treatment indicators, and authenticity signals, then estimates market value. It is free to try.
Over the past 30 days the diamond index moved +1.4%. Gem prices move on supply, demand, and metal markets; treat any single stone as a collectible first and an asset second.