Quick answer: the crystals most often faked are moldavite, turquoise, citrine, amber, malachite, and a handful of colorful “stones” that are really glass: opalite, cherry quartz, strawberry quartz, goldstone, and blue obsidian. Most fakes are glass, plastic, resin, or a cheap stone that has been dyed. The good news is that almost every one of them gives itself away if you know where to look.
“How can I tell if a crystal is real or fake?” is one of the most-searched questions about crystals online, and for good reason. The market is full of material that is honestly labeled at the factory and then quietly renamed three sellers later. Here are the nine imitations you are most likely to run into, what each one really is, and the tell that exposes it.
1. Opalite (glass sold as a “natural” stone)
Opalite is a man-made glass with a milky blue-white glow that turns peachy-orange against a dark background. There is nothing wrong with it as long as it is called glass. The problem starts when it is sold as “sea opal,” “moonstone,” or a “natural opalite crystal.” Real opal shows play-of-color (flashes of separate spectral colors that move as you tilt it). Opalite shows one even glow, and it often contains tiny round air bubbles you can see with a loupe.
2. Cherry quartz and strawberry quartz
The bright red-pink “cherry quartz” sold in bulk is glass with swirled color streaks. Natural strawberry quartz does exist (quartz colored by tiny inclusions of red iron minerals like hematite or lepidocrocite), but it looks speckled and uneven, never like candy. If the color looks poured rather than grown, it was.
3. Goldstone
Goldstone is glass with suspended copper crystals that glitter like a night sky. It has a fun backstory (a Venetian glassmaking tradition dating back centuries) and it is a perfectly good decorative material. It is not a mineral, not “sunstone,” and not “monk’s gold” from any mine.
4. Moldavite
Moldavite is the single most-faked collector stone of the last few years. Real moldavite is natural glass blasted out of a meteorite impact in southern Germany roughly 15 million years ago. Fakes are usually green bottle glass, either molded into “sculpted” shapes or etched with acid. Real pieces tend to have a deeply sculpted, irregular surface, elongated or rounded bubbles, and swirly worm-like inclusions of pure silica glass called lechatelierite. Fakes are often too uniform, too transparent, too emerald-green, and too cheap. We go deeper in Is Moldavite Worth Buying?.
5. Turquoise (dyed howlite and magnesite)
Howlite and magnesite are white, porous minerals that take dye beautifully. Dyed blue and given dark veins, they become “turquoise.” Look closely at chips and drill holes: dye sits on the surface and in cracks, so you will often see white showing through at an edge, or color pooled heavily in the veins. A cotton swab with a little acetone will sometimes pull color off a dyed piece (test on an unseen spot).
6. Citrine (heated amethyst)
This one is a gray area rather than an outright fake, because heated amethyst is still real quartz. But most of the bright orange “citrine” clusters on the market started life as purple amethyst and were baked in a kiln. Natural citrine is usually pale yellow to smoky honey and evenly colored. Heated amethyst often has white bases and dark orange tips, which is the opposite of how natural color zoning tends to look. The full story is in Citrine: Why Most of It Started Out as Amethyst.
7. Amber (plastic, resin, and copal)
Real amber is fossilized tree resin millions of years old. Fakes range from plastic to young resin called copal. A classic test: real amber floats in heavily salted water (about one part salt to four parts water by volume), while most plastic sinks. Insects that look perfectly posed, too many of them, or perfectly clear “amber” with a modern-looking bug are red flags.
8. Malachite
Look for printed or resin-bonded “malachite.” Natural malachite’s bands follow the curved, bubbly shapes it grew in, and the bands never repeat exactly. Plastic imitations are light, warm to the touch, and the pattern can look stamped. “Reconstituted” malachite is real malachite powder glued with resin, and it should say so.
9. Aura quartz and “blue obsidian”
Aura quartz (angel aura, aqua aura, rainbow aura) is real quartz that has had metal like titanium, niobium, or gold bonded to its surface in a vacuum chamber. It is a treatment, not a fake, but it should always be disclosed. Bright “blue obsidian,” on the other hand, is almost always glass. Natural obsidian is overwhelmingly black, brown, or dark green.
Five quick tests that catch most fakes
- The bubble check. Round bubbles under a 10x loupe usually mean glass. Natural crystals have inclusions too, but they are rarely perfect little spheres.
- The temperature check. Quartz conducts heat better than glass or plastic, so a real quartz piece feels noticeably cool against your cheek or lip, and plastic feels warm.
- The scratch check. Quartz is 7 on the Mohs scale and will scratch ordinary glass (about 5.5). Only try this on an inconspicuous spot of a piece you own.
- The color check. Nature rarely makes neon. Even, saturated color with no zoning is a reason to ask questions. See how to tell if a crystal is dyed, heated, or coated.
- The price check. If a stone that sells for $5 a gram everywhere else is $5 for a bag, it is not the same stone.
Fake, synthetic, or treated: they are not the same thing
It helps to keep three words straight. A fake (an imitation or simulant) is a different material pretending to be something else, like glass sold as moldavite. A synthetic is the real mineral grown in a lab, chemically identical to the natural one; lab-grown bismuth and lab-grown quartz are examples, and there is nothing dishonest about them when they are labeled. A treated stone is the real natural mineral that has been heated, dyed, or coated. All three are fine to own. The only real problem is when the label lies. Our explainer on synthetic vs. natural crystals goes into how lab growth works.
The simplest protection is buying from sellers who tell you exactly what a piece is and where it came from. Every specimen in our shop is listed with its locality where known and photographed as the actual piece you receive, and any lab-made or refined material (like our 99.99% bismuth) is named as such. When we do not know something, like the Stilbite — Nova Scotia, we say so.
