How to Tell if Pearls Are Real (5 Tests You Can Do at Home)

Yes, the tooth test is real, and yes, it actually works. But before you go rubbing strangers’ pearls against your teeth, let’s clear up one thing: “real” doesn’t mean “natural.” Almost every real pearl sold today is cultured (grown in an oyster with a little human help), and those are 100% real pearls. The fakes we’re catching here are the glass and plastic imitations. Here are five ways to tell the difference at home.

1. The tooth test (the famous one)

Gently rub the pearl along the biting edge of your front tooth. Real pearls feel slightly gritty or sandy, because their surface is made of microscopic layers of nacre. Fakes feel glassy-smooth. This is the test jewelers reach for first, it takes five seconds, and it’s surprisingly hard to fool. (Wipe the pearl after. Manners.)

2. The temperature test

Pick up the pearl after it’s been sitting at room temperature. Real pearls feel cool against your skin for a moment before they warm up. Plastic fakes feel room-temperature right away because plastic doesn’t pull heat the way nacre does. Glass fakes can feel cool too, so pair this one with the tooth test.

3. Look for imperfection

This is the counterintuitive one: flaws are good. Real pearls have tiny irregularities in shape, surface, and overlap of color, and no two on a strand are identical twins. If every pearl is flawlessly round, the same size, and a perfect color match, be suspicious. Nature doesn’t mass-produce; factories do. A loupe or even your phone’s macro mode makes the little surface bumps and ridges easy to see.

4. The weight and the drill holes

Real pearls have a bit of heft (they feel slightly heavier than you expect, definitely heavier than plastic). Then check the drill holes. On real pearls the holes are clean and small, and the nacre around them stays put. On fakes the coating often chips or flakes around the hole, revealing the glass or plastic bead underneath. A flaky, shiny-bead edge is a dead giveaway.

5. The rub-together test

On a strand, gently rub two pearls against each other. Real pearls have a slight resistance and that same fine, sandy friction from the tooth test. Fakes glide past each other smoothly and silently. It’s a good quick check for a whole necklace at once.

Real doesn’t always mean valuable

Here’s the nuance worth knowing before you buy or sell: a strand can be 100% real cultured pearls and still be modestly priced, while a vintage glass strand (think old costume pearls) can be genuinely collectible. Real versus fake is one question. Value is a different one, and it depends on luster, size, surface quality, and how the piece is made. If you’re sorting through a jewelry box, the costume vs fine jewelry guide helps you place a piece, and how to price jewelry for resale covers what it’s worth.

One care note while you’re here

Whatever you’ve got, pearls are soft and porous, so they need gentler handling than the rest of your jewelry: no soaking, no chemicals, no ultrasonic cleaners, just a soft damp cloth. The full rundown is in how to clean jewelry at home.

Browse pre-loved pearls on StillSparkly.