Updated as of June 2026
Obsidian
A natural volcanic glass long used for tools and mirrors, regarded in tradition as a protective and grounding stone.
Price range$1 to $40/ct
Hardness (Mohs)5.25
ColorsBlack, Brown, Gray, Rainbow sheen
BirthstoneNone
AltGems Score How we score
4.6/10
Obsidian pros and cons
Pros
- Strong value for the look
- Usually sold untreated
Cons
- Softer at Mohs 5.25, best in protected settings
- Opaque, so it shows color rather than sparkle
Obsidian is best kept for earrings, pendants, and protected settings rather than rough daily wear.
Explore Obsidian
Meaning and properties
Symbolism, zodiac, chakraPrice and value
What it costs and whyBuying guide
How to choose and where to buyCare and cleaning
Keep it looking its bestObsidian jewelry
Obsidian ringsObsidian engagement ringsObsidian necklacesObsidian pendantsObsidian earringsObsidian bracelets
Common buying mistakes
- Buying on carat weight alone instead of color and cut, which drive beauty more.
- Skipping treatment disclosure, which changes both value and care.
- Setting this softer stone (Mohs 5.25) in an exposed daily-wear ring instead of a protective bezel or halo.
- Cleaning it the wrong way. Brittle and can chip to sharp edges. Clean with warm soapy water and a soft cloth. Avoid knocks and ultrasonic cleaners.
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Where to buy Obsidian: for fine pieces, choose established jewelers with clear return policies and lab reports; for unique or budget pieces, vetted marketplace sellers work well. Always confirm treatment and the return window before buying. AltGems prices are general per-carat guides, so verify value with a certified gemologist or GIA report.
Frequently asked questions
What is Obsidian?
A natural volcanic glass long used for tools and mirrors, regarded in tradition as a protective and grounding stone. It rates 5.25 on the Mohs hardness scale and commonly appears in black, brown, gray, rainbow sheen.
How much does Obsidian cost?
Obsidian typically runs about $1 to $40 per carat depending on color, clarity, cut, and origin. See our Obsidian price guide for detail.
Is Obsidian good for everyday jewelry?
It rates 5.25 on the Mohs scale, so it suits earrings, pendants, and occasional-wear rings better than daily rough use.
What is the AltGems Score for Obsidian?
Obsidian earns an overall AltGems Score of 4.6 out of 10, balancing durability, brilliance, value, rarity, and everyday wearability. See our methodology on the How We Score page.
How do I care for Obsidian?
Brittle and can chip to sharp edges. Clean with warm soapy water and a soft cloth. Avoid knocks and ultrasonic cleaners.