A market-wide average across qualities and sizes. Your stone's value depends on carat, color, clarity, cut, treatment, and origin.
Obsidian is a natural volcanic glass formed by rapid cooling of high-silica lava. It is typically black but can also appear gray, brown, mahogany, green or even nearly colorless, and may display special effects such as sheen (silver or gold), rainbow iridescence, or concentric 'eye' patterns (e.g., rainbow or apache tears). With Mohs hardness about 5–5.5 and conchoidal fracture, it is brittle and can chip or break if struck.
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 obsidian is $2.92 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 obsidian index moved -2.7%. Gem prices move on supply, demand, and metal markets; treat any single stone as a collectible first and an asset second.