Is Your Obsidian Real or Fake?
How to tell genuine obsidian from imitations
Obsidian is itself a natural glass, so the issue isn't 'glass vs stone' — it's man-made glass and slag sold as obsidian, especially for the pricier 'rainbow,' 'blue,' 'green,' and 'cherry' varieties, many of which are simply manufactured colored glass.
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Common obsidian fakes & look-alikes
- Manufactured colored glass. Bright, evenly colored 'blue,' 'green,' or 'cherry obsidian' is almost always man-made glass — those vivid single colors don't occur in natural obsidian, which is black (sometimes with sheen or snowflake patterns).
- Goldstone. Man-made copper-fleck glass ('goldstone') has a dense, regular metallic sparkle that natural obsidian never shows.
- Glass slag. Industrial glass slag is sold as obsidian; it may show abundant air bubbles and unnatural swirls of color.
Simple at-home tests
- 1Color reality check. Natural obsidian is black — sometimes with silver/gold sheen, rainbow flash, or white 'snowflakes.' Solid bright blue, green, purple, or red is a manufactured-glass flag.
- 2Effect vs dye. Natural sheen and rainbow come from internal nanolayers, not surface color. A flat, painted-looking color layer suggests manufactured glass.
- 3Bubbles under a loupe. Dense, uniform round bubbles suggest manufactured glass; natural obsidian may have a few but not regular, heavy bubbling.
At-home tests are indicative, not definitive — for valuable pieces, get a professional gemologist's opinion.
The bottom line
Black obsidian with natural sheen, rainbow, or snowflake effects is genuine. Vividly colored 'obsidian' in blue, green, or cherry-red is manufactured glass, not a natural stone.
FAQ
- How can I tell if my obsidian is real?
- Black obsidian with natural sheen, rainbow, or snowflake effects is genuine. Vividly colored 'obsidian' in blue, green, or cherry-red is manufactured glass, not a natural stone.
- Is obsidian worth anything?
- Plain black obsidian is cheap, but rainbow, fire, and sheen varieties plus skilled carvings reach $30–$200+.
- Is obsidian just glass?
- Yes — it's natural volcanic glass. Its value is about variety, optical effects, and craftsmanship rather than rarity of the material.
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