Author
Through a professional technical team, we provide customers with targeted equipment selection recommendations and comprehensive after-sales services, winning the trust and recognition of customers.
Black obsidian has that unique, glassy look. It’s sharp, mysterious, and surprisingly heavy for its size. But let’s be real for a second—walk into any crystal shop or scroll through Etsy, and half the “obsidian” you see is either cheap slag glass or colored acrylic.
I’ve been collecting crystals for about six years now, and I still remember the first fake I bought. It was a polished sphere. Looked perfect online. When it arrived, it felt warm and light. That was my first clue: real obsidian never feels warm in your hand.
So, how do you avoid making the same mistake? Here are the tried-and-true methods that actually work.
This one sounds almost too simple, but it works. Hold the stone in your closed fist for about 30 seconds. Real black obsidian is volcanic glass. It conducts heat slowly. So it will feel cold when you first pick it up, and it’ll stay cool for a while.
Fakes—especially resin or acrylic—warm up fast. Within 10 to 15 seconds, they’ll reach your body temperature. Glass fakes can be trickier, but they often feel warmer than obsidian too.
One friend of mine once joked that real obsidian “fights back” against your hand heat. There’s some truth to that.
Real obsidian is rarely perfectly black. Hold it up against a bright window or use your phone’s flashlight. Natural obsidian often has tiny white or grayish specks, sometimes even small bubbles from gas trapped during rapid cooling. It might also show faint banding or a slightly brownish tint when light passes through.
But here’s the catch: many fakes have bubbles too. The difference? In fake glass or resin, bubbles are usually round and uniform. In real obsidian, inclusions look more irregular, almost chaotic.
If the stone is pitch black with zero imperfections under bright light? That’s suspicious. Nature doesn’t do perfect.
Real obsidian is famous for one thing: it can be sharper than surgical steel. That’s why ancient cultures used it for blades. If you have a raw or roughly shaped piece, gently run your thumb along the edge—very carefully. A real piece will feel razor-like on any sharp ridge.
Fakes made of resin or plastic won’t cut you. They’ll feel dull. Glass fakes might have sharp edges, but they won’t have the same conchoidal fracture pattern. Obsidian breaks with curved, shell-like surfaces. Imitation glass breaks more like a bottle.
Don’t hurt yourself testing this. Just a light touch along a non-polished edge is enough.
Pick up the piece. Then imagine something similar sized made of standard glass. Real obsidian is dense. It has a specific gravity around 2.4. That means it should feel noticeably heavier than it looks.
Acrylic fakes? Those feel almost hollow. Glass imitations sometimes get the weight right, but they’re often lighter or oddly balanced. I once compared a real obsidian sphere and a fake one side by side — same size, but the fake was 40% lighter. My hand knew immediately.
If you’re buying online and can’t hold it, ask the seller for the exact weight. Compare it to known dimensions. If they hesitate, move on.
Ignore anyone who tells you to shine a light straight through obsidian to see “smoky layers.” That only works for thin slices. A thick palm stone won’t show anything.
Instead, try this: take the stone into a dark room. Use a focused flashlight at a low angle, grazing the surface. Real obsidian often reveals subtle conchoidal fractures or tiny surface undulations that catch the light. Fakes tend to have a uniform, almost plastic-smooth surface under the same light.
Another trick: wet the surface slightly. Real obsidian’s luster changes when wet—it gets deeper, almost oily. Most fakes just look wet.
Let’s be honest. If you see a large, perfect black obsidian skull for
8–20 depending on size and quality. A carved piece? Easily $40 and up.
Sellers to watch out for:
Listings that say “natural obsidian” but also “man-made material” in the fine print.
Stores from regions with no volcanoes (obsidian forms from lava).
Anyone who refuses macro photos under good lighting.
I learned this the hard way after buying “genuine Apache tear” obsidian from a seller in Florida. Turned out to be tumbled industrial glass.
Obsidian ranks about 5 to 5.5 on Mohs hardness scale. That means it will scratch regular glass, but a steel knife blade will scratch it. If you’ve got a piece you’re fairly sure is fake, try scratching the bottom with a steel nail. Resin will gouge easily. Real obsidian will show a faint scratch but won’t peel or dent.
Don’t do this on polished faces if you care about the stone’s appearance.
No single test is perfect. Some high-quality glass fakes can pass the weight test. Some natural obsidian pieces are unusually clean. Use two or three methods together.
And here’s a tip most guides won’t tell you: trust your hands more than your eyes. Obsidian feels different. It’s cooler, denser, and when you tap two pieces together, they make a higher-pitched clink than standard glass.
Fake crystals have gotten scarily good over the past few years. But they still can’t mimic the natural irregularities of volcanic glass. Once you’ve held real obsidian, you’ll spot fakes from across the room.
English
Français
عربي
Deutsch