If you're shopping for obsidian, two questions come up most: whether what you're looking at is real obsidian or just black glass, and which kind to get now that there's rainbow, gold sheen, silver sheen, and snowflake on the market. Here is how to sort it out, plus how to wear it and keep it.
Real Obsidian vs Black Glass
This one is genuinely tricky, because obsidian is glass. It is volcanic glass, formed when lava cools too fast to crystallize, so unlike most stones there is no crystal structure or grain to look for. What you can check: real obsidian almost always has tiny gas bubbles or faint flow lines inside, visible when you hold a polished piece up to light. Molded black glass tends to be too clean and too perfectly uniform. Obsidian also has a distinctive wet-looking luster and a shell-like fracture on any chipped edge.
The harder confusion is obsidian versus black onyx or black agate, which are true chalcedony and a little harder. Polished, they look alike, but onyx reads more opaque while obsidian has that glassy shine. For most buyers it matters less which dark stone you end up with, and more that you are not paying obsidian prices for pressed glass.
The Types, and Who Each One Suits
Plain black obsidian is the most common and the most versatile. Deep even black with a high shine, it works with anything and stays the most understated of the dark stones.
Rainbow obsidian hides bands of green, purple, and gold that only show at certain angles, thrown by microscopic mineral layers inside. It looks plain black until it catches light, then flashes color. Gold sheen and silver sheen obsidian carry a soft metallic shimmer from a layer of aligned gas bubbles. Snowflake obsidian is black flecked with grey-white, from small cristobalite crystals. For a first piece I would go plain black or rainbow. The sheen and snowflake types are better as a second piece, once you want something with more movement in it.
Bead Size and Pairing
Obsidian's flat black looks heavy, so size matters more here than with lighter stones. 8 to 10mm is the easy everyday range, while 12mm and up makes a statement and tends to be worn by men. Because it is so dark and neutral it pairs with almost anything, and you will often see it strung with tiger eye or turquoise, where the black grounds the brighter stone. Silver and brass both work as accents.
Obsidian in Himalayan and Tibetan Wear
In many Himalayan and broader Asian wearing traditions, obsidian is treated as a grounding, protective stone, often described as absorbing or deflecting negative energy. You will also hear that if an obsidian piece breaks, it "took" something for you. These readings vary a lot by region and teacher, so treat them as folklore rather than fact. As an everyday stone it is simply a deep, glossy black that suits most people.
Caring for Obsidian
This is where obsidian asks for more care than quartz stones. Being glass it is softer, around 5 to 5.5 on the Mohs scale, and brittle, so it scratches and chips more easily than tiger eye or agate. Store it apart from harder stones, keep it from knocking against hard surfaces, and take it off for anything rough on your hands. A wipe with a soft cloth is all the cleaning it needs.
Choosing a stone for protection specifically? See the best stones and crystals for protection.
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Real obsidian usually shows tiny gas bubbles or faint flow lines inside and a shell-like fracture on any chip, while molded glass looks too uniform. The more useful question for most buyers is value: do not overpay for plain pressed glass sold as something rarer.
It is softer and more brittle than quartz stones, around 5 to 5.5 on the Mohs scale, so it chips and scratches more easily. Store it away from harder stones and avoid hard knocks.
There is a common belief that it absorbed something protective on your behalf, though that varies by tradition. In practical terms, obsidian breaks because it is brittle volcanic glass.
