How to Tell if Pearls Are Real or Fake

Luster, the tooth test and weight are the three checks almost every guide agrees on. Each one shows up in 10 of the 11 guides we read, and the drill hole follows at 8. Those are counts of how often a test is given, not how well it works: none of the 11 guides gives an accuracy rate.

Which tests do the 11 guides give?

Counts as of October 2026. Luster, the tooth test and weight lead at 10 of 11 each, with temperature, surface flaws and "ask a jeweler" right behind at 9. No guide gives a vinegar, lighter or hot-water test.

Jewelers Mutual puts the limit plainly: "no single test guarantees 100% accuracy. Consider trying a combination of tests to reduce the chance of error."

We compared the 11 guides on October 29, 2026. Nine come from pearl or jewelry sellers (The Pearl Source, Blue Nile, Na Hoku, Happy Jewelers, Graham's, Valltasy, PearlsOnly, Brilliant Earth, Winterson), one from a jewelry insurer (Jewelers Mutual) and one from a thrift store (Goodwill). Sellers gain when buyers trust pearls, so weigh their verdicts with that in mind.

A test counts when a guide gives it as a way to check; a warning alone does not count. The GIA lab note quoted further down is an extra source, not one of the 11. We didn't handle any pearls for this page. Southern Living, a Bollwerk Joailliers guide and a Reddit thread were on our list but would not load for us, so they are not counted.

How do you do the tooth test without damaging the pearl?

Rub one pearl lightly along the edge of your front teeth and feel for grit. Ten of the 11 guides give this test, but they split on how hard to go, so here is the gentle version.

1. Rub, don't bite. The Pearl Source says: "Rub the pearl gently against the edge of your front teeth." Blue Nile says a test done this way "won't scratch the pearl." Graham's is the one guide that says to bite; we side with Blue Nile and Winterson here.
2. Feel for grit. Graham's says pearls that feel "slightly rough and gritty against your teeth" are likely real, while fakes feel smooth.
3. If you would rather not use your teeth, use two pearls. Happy Jewelers suggests you "rub two pearls from the necklace softly against each other." Graham's warns that rubbing "too hard" can damage the outer layer.

Blue Nile also notes that "high-quality imitation pearls can mimic this texture." Treat a gritty feel as one vote among several.

Rather keep pearls away from your teeth? The YouTube channel Treasure Everywhere! has a video called How to Identify Pearls (without putting them in your mouth).

Do real pearls feel cold?

Yes, at first. Real pearls feel cool on your skin and warm up slowly as you wear them, and 9 of the 11 guides give this check. The Pearl Source puts it as "cool to the touch at first, then gradually warm up with wear." Hold one against your cheek or the inside of your wrist.

Glass is the catch: Blue Nile and Jewelers Mutual both say glass fakes "feel cold" too. So a cool pearl only rules out plastic, which is still useful: it takes two seconds against your cheek.

Are real pearls heavy?

Real pearls feel heavier than they look, and 10 of the 11 guides say so. Plastic fakes feel light, so bounce the strand in your palm and compare it with a costume necklace of the same size if you have one.

Glass again passes: Jewelers Mutual says "some glass pearls can also have some weight to them," and Graham's calls weight "not necessarily a foolproof way to test."

What does the drill hole tell you?

Look where the string goes in, ideally with a loupe. The Pearl Source says real pearls "have clean, sharp drill holes with visible nacre layers." Fakes "may show chipped paint or coating peeling away at the hole," according to Happy Jewelers.

Eight of the 11 guides give this check.

Knots are a softer clue. Na Hoku says "higher-quality pearl strands are usually individually knotted on silk or nylon cord." The Pearl Source says the knots sit between pearls "to prevent them from rubbing against each other." Only 5 of the 11 guides mention knots, so treat them as a hint.

Which home tests can a fake pass?

Glass fakes pass the most. Each common home test has at least one fake that slips through it, which is why 9 of the 11 guides end with "see a jeweler."

Majorica pearls are the hardest case. Blue Nile describes them as "solid glass beads coated with a mixture that includes fish scales and mother-of-pearl," and PearlsOnly calls them "the most convincing fakes out there."

Even labs work at it. A GIA lab note from 2025 found one imitation among about 9,360 pearls and says spotting fakes mixed into large lots "can be a challenge."

Real, cultured, freshwater, shell or Majorica: what is what?

Cultured and freshwater pearls are real pearls. Shell pearls and Majorica pearls are imitations.

Jewelers Mutual says "Cultured pearls make up 99% of the pearls sold today," so a real strand you find or buy is almost certainly cultured. Mother-of-pearl is its own thing: Blue Nile calls it "neither a real pearl nor an imitation."

How do you check pearls before you buy?

You can't rub or weigh a pearl through a screen. So read the listing like a skeptic.

• Ask for paperwork. Five of the 11 guides mention seller certificates, and Valltasy says a seller who can't provide one is "a red flag."
• Read the price. Brilliant Earth says "extremely inexpensive 'pearls' are almost certainly fake."
• Look at the clasp. PearlsOnly treats a flimsy clasp on "fine jewellery" with "immediate suspicion."
• Check the word itself. Freshwater or Akoya names a real pearl type; "shell pearl," "glass pearl" or "faux" means an imitation, whatever the photo looks like.

If you want a real pearl set for a wedding, our bridesmaid jewelry picks include freshwater pearl pieces with their listing details. For older pieces, vintage jewelry shops on Etsy are where these checks matter most. Those two guides carry Etsy affiliate links, and this page has none.

Pearl is also the June birthstone: 13 of the 14 lists in our birthstones by month guide name it.

When should you take pearls to a jeweler?

Take them in when the strand is worth a lot, when home tests disagree, or when you plan to sell. Nine of the 11 guides send you to a jeweler or lab for the final word. Blue Nile says "a professional inspection is the only way to confirm pearl authenticity with certainty."

A lab can use X-ray. The Pearl Source says it shows "concentric growth rings inside" a real pearl, and Winterson says labs run "a range of tests including X-ray examination." Strands run "anywhere from $50 to $100,000+," per Brilliant Earth. None of the 11 guides gives a price for a check, so ask the jeweler for a quote before you bring the strand in.

Our guides on how to tell if gold is real and how to tell if silver is real cover the clasp and setting. If a strand comes out of a drawer in a knot, untangle the necklace before you start.