How to tell if your pearls are real
The Guide on How to Distinguish Real and Fake Pearls
There is a wide range of natural and fake pearls — knowing how to spot real pearls is a genuinely useful skill. Here's what to look for.
Why It Matters
Pearls have been treasured for centuries. They're organic, luminous, and irreplaceable in the jewellery world. But because they're so beloved, the market has always been full of imitations.
There are more new, cultured kinds of pearls that are filling the demand for pearls. On the other hand, there are more well-made fakes — from glass and plastic to high-quality synthetic alternatives that can fool even an experienced eye at first glance.
Real — whether natural or cultured — behave differently from imitations. They feel different, look different, and age differently. And if you're caring for them, repairing them, or considering them for redesign, knowing what you're working with makes all the difference.
Pearls' temperature: The Simplest Place to Start
I usually have no problem differentiating glass or acrylic pearls from the organic ones. But sometimes, fake pearls are really well made! The first step I take is to check the temperature of the pearls. Natural pearls are always cold when not worn. They catch the warmth of the body when worn, so this way is the best to check a piece that is not currently used.
The Tooth Test
The oldest trick in the book, which works great.
Gently rub the pearl against the edge of your front tooth. A real pearl — natural or cultured — will feel slightly gritty or sandy. An imitation pearl (usually glass or plastic coated with a pearlescent finish) will feel perfectly smooth and glassy.
It sounds almost too simple, but the gritty sensation comes from the natural layered structure of nacre — the material that makes pearls what they are. That texture simply can't be perfectly replicated in a synthetic coating.
🐚 Tip: Be gentle. You're not scratching the pearl, just feeling the surface against your tooth enamel. This test won't damage your pearls or teeth.
Look Closely at the Surface
Real pearls are made by living creatures, which means no two are identical. When you look at a strand of genuine pearls, you'll notice subtle variations — tiny imperfections, slight differences in shape, gentle variations in lustre from pearl to pearl. This is a sign of authenticity, not a flaw.
Imitation pearls, by contrast, tend to look unnaturally perfect. The coating is applied uniformly, so the colour, shape, and shine are almost identical from bead to bead. If your strand looks too perfect, that's worth noting.
You can also look at the drill holes. On a real pearl, the hole edges are sharp and clean. On an imitation, the coating often chips or peels slightly around the hole, and you may be able to see the glass or plastic core underneath.
The Weight Test
Real pearls have a satisfying weight to them. Lift the piece in your hand — does it feel dense and substantial, or surprisingly light? Plastic imitations in particular, are noticeably light. Glass imitations are heavier and can sometimes be confused with real pearls by weight alone, so this test works best in combination with others.
Check the Lustre
The lustre of a real pearl has depth to it. When you look at it, the light seems to come from within the pearl, not just from its surface. You'll see a soft, glowing reflection that shifts slightly as you move the pearl.
Imitation pearls tend to have a surface shine — bright and reflective, but flat. It's the difference between a glow and a gloss.
This is one of the most beautiful things about genuine pearls, and once you know what to look for, it becomes very easy to see.
Natural vs. Cultured Pearls: What's the Difference?
It's worth clarifying something that often causes confusion. Both natural and cultured pearls are real pearls. The difference is how they formed.
Natural pearls form entirely on their own, without human involvement, when an irritant enters a mollusc. They're extremely rare and valuable.
Cultured pearls are grown with a little human help — a small nucleus is introduced into the mollusc, which then coats it in nacre over time. The vast majority of pearls on the market today are cultured, and they are absolutely genuine. Freshwater pearls, which are among the most common, are typically cultured.
Imitation pearls, on the other hand, are not pearls at all. They're usually glass or plastic beads coated in a pearlescent material to mimic the look of a pearl. They contain no nacre whatsoever.
What About the Pearl Test Results? A Quick Summary
| What you feel/see | Most likely means |
|---|---|
| Cold in touch | Real pearl (natural or cultured) |
| Gritty against the tooth | Real |
| Smooth against the tooth | Imitation pearl |
| Subtle variations in shape and lustre | Real pearl |
| Unnaturally uniform appearance | Imitation |
| Deep, glowing lustre | Real pearl |
| Bright surface shine only | Likely imitation or very expensive real pearls |
| Dense, satisfying weight | Likely real (especially vs. plastic) |
| Chipped coating around drill holes | Imitation |
When in Doubt, Ask
If you're still unsure — especially if the piece has sentimental or monetary value — it's always worth consulting a jeweller or gemologist, or me! A professional can also use tools like a loupe or even an X-ray to examine the pearl's internal structure, which is the most definitive test of all. I don't have an X-ray, but my trained eye can help you.
At Stones and Stuff Stockholm, we work with repurposed and vintage pearls regularly, and we're always happy to take a look at a piece you're curious about. Whether you're thinking of a redesign, a repair, or simply want to know what you have, feel free to get in touch.
Take Good Care of What's Real
Once you know your pearls are genuine, it's worth treating them accordingly. Pearls are the most delicate of all jewellery materials — they're organic, sensitive to moisture, perfume, and temperature changes, and they need a little extra attention to stay beautiful.
If you'd like to know more, our Jewellery Care Guide covers everything you need to know about keeping your pearls (and other pieces) in excellent condition for years to come.
Written by Julia Z. / Stones and Stuff Stockholm — handmade jewellery and accessories, made with upcycled pearls, stones and crystals in a studio outside Stockholm.