If you are wondering whether your pearls are real, it helps to know what “real” means in the jewellery trade. A pearl grown by an oyster or mussel on a pearl farm is a real pearl. That covers almost every pearl sold in jewellery shops today. A fake pearl is a bead made to look like one, usually plastic or glass with a pearly coating.
Several simple checks can help you tell the two apart at home. They have limits, and some imitations are convincing. This guide explains what each check can show you, what it can’t, and when it makes sense to ask a professional.
Look at the drill holes, compare the pearls across the piece, gently rub two pearls together, look at the glow and colour, and notice the weight. No single check is conclusive, but together they give you a reliable first impression.
Real, cultured and imitation pearls
Three terms come up often, and they mean different things.
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Natural pearls form in the wild with no human involvement. They are rare and usually sold with laboratory paperwork.
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Cultured pearls are grown on farms. People start the process, and the oyster or mussel builds the pearl layer by layer. GIA, the Gemological Institute of America, confirms that cultured pearls are real pearls.
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Imitation pearls are made from other materials. GIA lists plastic, shell and composites, and glass is common too.
5 ways to check pearls at home
1. Look at the drill hole
The drill hole is the tiny opening a pearl is strung or mounted through, and it often shows what lies beneath the surface. Many imitations are coated beads, so the coating can chip or peel around the hole and reveal a different material.
Check it in bright light, using a small loupe if you have one. A clean, tidy hole is encouraging, but it isn’t proof. Wear around the hole on an older piece doesn’t automatically mean imitation.
Some genuine pearls grow around a small bead, and you may see a faint line where the pearl layers meet it. Many freshwater pearls have no bead at all, so that line won’t always appear.
2. Compare the pearls across the piece
Look at the whole necklace, or both earrings. Genuine pearls are grown by living animals, so they vary slightly in size, shape, colour and surface marks. A set where every pearl looks identical is worth a closer look.
Careful matching is normal in good jewellery, though, and an uneven shape isn’t a warning sign. Baroque pearls are genuine pearls with irregular shapes, and many people choose them for exactly that character.
3. Try the rub test, gently
Rub two pearls from the same piece lightly against each other. You can also draw one pearl across the edge of a front tooth. The pearl layers, called nacre, usually feel slightly gritty, like very fine sand. Many imitations feel smooth and slick.
There are a few cautions:
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Keep the pressure light. Pearls are soft, and tooth enamel is harder.
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Some imitations are coated to feel gritty, so grittiness isn’t proof.
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The test can’t separate natural from cultured pearls or reveal treatments.
4. Look at the glow and colour
Hold the pearl under good light and tilt it slowly. A good pearl has a soft glow that seems to come from just beneath the surface. Many also show a faint tint of another colour that shifts as you move them, such as pink, green or silver. Jewellers call that tint overtone.
Shine on its own tells you very little. GIA describes high lustre as sharp, bright reflections on the surface, so a crisp reflection isn’t a sign of a fake. Glass and coated beads can look glossy too, and plenty of genuine pearls look fairly plain. A flat, chalky pearl is lower in quality, but it isn’t necessarily imitation.
5. Notice the weight
Pick the piece up and see how it feels. Plastic imitations are usually very light for their size, while genuine pearls feel a little more solid in the hand. Glass beads can be heavy too, so weight only helps if you suspect plastic.
You may also hear that real pearls feel cool when you first pick them up. That’s a rule of thumb, not a proven test, and glass can feel cool as well. Weight is most useful as a comparison, so if you have a pearl you know is genuine, hold the two side by side.
Tests to avoid
Some “tests” online can permanently damage pearls, so it’s worth steering clear of them. Please don’t:
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hold a flame or hot needle to a pearl
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use vinegar or any other acid
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scratch or scrape the surface
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drop a pearl to see if it bounces
Pearls are soft. GIA lists their hardness at 2.5 to 3, so acid etches them, heat can mark them and scratches stay. The International Gem Society also advises against acid testing pearls, since gentler options exist.
What home checks can’t tell you?
Home checks can suggest whether something is a pearl or an imitation. They can’t tell you whether a pearl is natural or cultured, whether it has been treated, or where it was grown.
Colour is a good example. Pearl colour can be altered by dyeing, so a dark pearl isn’t automatically a Tahitian pearl. Genuine Tahitian black pearls are naturally dark, often with grey, green or peacock tones, but you can’t confirm that by eye. If you are shopping for Tahitian pearls, ask the seller whether the colour is natural.
Separating natural pearls from cultured ones usually requires X-ray testing in a laboratory. That rarely matters for everyday jewellery, since nearly all of it is cultured. It matters when a seller describes a pearl as natural.
When to get a professional opinion
A professional assessment is worth considering when:
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the pearls are inherited
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they are valuable, financially or sentimentally
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they are sold as natural pearls
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your own checks give mixed results
An experienced jeweller can often tell pearl from imitation under magnification. Not every jeweller can give a definitive answer, though, and separating natural, cultured and treated pearls is laboratory work.
GIA’s Pearl Identification Report records whether a pearl is natural or cultured, along with any treatments that can be detected. In Australia, Gem Studies Laboratory in Sydney lists pearl X-ray testing among its services, and the Gemmological Association of Australia can help you find a qualified gemmologist. Confirm current services and fees before sending anything in.
What to look for when buying pearls online
When you can’t hold the pearl, the listing does the work. A good listing names the pearl type clearly, such as freshwater, South Sea or Tahitian cultured pearls. It also gives the size and colour, and says whether the colour is natural.
Clear close-up photos help, especially of the drill holes. Photos can’t prove authenticity, but a seller who shows detail and answers questions plainly is easier to trust.
Read the returns policy before you pay, so you have time to examine the pearls yourself. Our guide on what to check before buying pearls online covers listings in more detail.
Frequently asked questions
Are shell pearls real pearls?
No. Shell pearls are generally treated as imitation, because no oyster or mussel grew them as a pearl. A genuine pearl should be described by type, such as “freshwater cultured” or “South Sea cultured”.
Are freshwater pearls real?
Yes. They’re cultured pearls grown in mussels. Most have no bead inside, so they’re nacre all the way through. They often come in button, oval or baroque shapes, which is perfectly normal.
Why do some genuine pearls look dull?
A pearl can be genuine without being high quality. Lustre, surface marks, shape and colour all affect how it looks, so a real pearl can still appear plain. Our guide to pearl grading explains how quality is judged.
A sensible next step
Start with the drill holes and the piece as a whole. Then try the gentle rub test if you’re comfortable with it. If you can, compare your pearls with ones you know are genuine, because the difference is much easier to spot side by side than to describe.
If the pearls matter to you, have a qualified gemmologist look at them. Home checks narrow the question down, but they don’t settle it. If you are simply looking for pearls you can trust, you can browse the full pearl collection and compare any piece against the points above.
