A market-wide average across qualities and sizes. Your stone's value depends on carat, color, clarity, cut, treatment, and origin.
Grandidierite is known for its striking blue-green color, which can exhibit a unique pleochroism, displaying different hues when viewed from different angles. It is relatively soft, with a hardness of 7.5 on the Mohs scale, and is typically found in cabochon cuts that enhance its color and transparency.
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 grandidierite is $2,441 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 grandidierite index moved -2.4%. Gem prices move on supply, demand, and metal markets; treat any single stone as a collectible first and an asset second.