A market-wide average across qualities and sizes. Your stone's value depends on carat, color, clarity, cut, treatment, and origin.
Heliotrope—more commonly known in the gem trade as bloodstone—is a dark green variety of chalcedony with distinctive red to brownish-red spots or streaks of iron oxide. It is opaque, with Mohs hardness about 6.5–7 and good toughness. The gem is valued for its pattern, contrast and long historical and symbolic associations rather than brilliance.
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 bloodstone is $13 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 bloodstone index moved -6.4%. Gem prices move on supply, demand, and metal markets; treat any single stone as a collectible first and an asset second.