Natural pearls form by chance inside a mollusk, cultured pearls form when a farmer inserts a bead or tissue for the mollusk to coat with nacre, and imitation pearls are manufactured beads with a pearly coating. Natural and cultured pearls are real pearls; imitations contain no nacre and must be labeled imitation.
Pearl, cultured pearl, freshwater pearl, faux pearl: the labels can be confusing, and they make a big difference to what you are buying. Here is what separates natural, cultured and imitation pearls, how to tell them apart and which one makes sense for you.
What is the difference between natural, cultured and imitation pearls?
The difference is how each pearl was made. A natural pearl forms by chance inside a mollusk with no human help. A cultured pearl is also made by a mollusk, but a pearl farmer starts the process by inserting a bead or a piece of tissue. An imitation pearl is not made by a mollusk at all; it is a glass, plastic or shell bead coated to look like pearl.
Natural and cultured pearls are both real pearls, built from layers of nacre, the iridescent material that gives pearls their glow. Imitation pearls have no nacre. That single difference drives everything else: how they look up close, how long they last, how they must be labeled and what they cost.
2.5 to 3
Mohs hardness of pearl
Nacre
What makes a pearl a pearl
Cultured
Nearly every pearl in stores today
What is a natural pearl?
A natural pearl forms when a tiny irritant gets inside certain oysters or mussels and the animal protects itself by coating the irritant with layer after layer of nacre. Over years, those layers build into a pearl. Because this happens by chance, and only a tiny fraction of wild mollusks ever produce a pearl, natural pearls have always been rare.
Before pearl culturing, natural pearls were among the most valuable jewels in the world. Overharvesting depleted most wild pearl beds, and today natural pearls appear mainly in antique pieces and at specialist auctions. If you are buying new pearl jewelry from a jewelry store, it is almost certainly cultured.
Natural pearls are identified by gemological laboratories, usually with X-ray imaging that shows the internal growth structure. You cannot reliably tell a natural pearl from a cultured one by eye, which is why natural pearls of any real value should come with a laboratory report.
What is a cultured pearl?
A cultured pearl is a real pearl grown with human help. A pearl farmer places a small bead or a piece of mantle tissue inside a living mollusk, then returns it to the water. The mollusk responds exactly as it would to a natural irritant, coating the nucleus with nacre. After months or years, the farmer harvests the pearl.
Saltwater cultured pearls, such as Akoya, South Sea and Tahitian, are usually grown around a bead, with a layer of nacre over it. Freshwater cultured pearls are usually grown from tissue alone, so they can be almost entirely nacre. Both are genuine pearls made by living animals, and both need the same gentle care.
Culturing made pearls affordable and consistent, which is why cultured pearls dominate fine jewelry today. Their quality varies widely, and luster, surface, shape, size and matching make a big difference to beauty and value. The guide to evaluating pearl quality covers each factor. Matching matters most in strands and pairs of earrings, where small differences in size or color are easy to see side by side.
| Feature | Natural | Cultured | Imitation |
|---|---|---|---|
| How it forms | By chance, around a tiny irritant | Around a bead or tissue a farmer inserts | Manufactured from glass, plastic or shell |
| Nacre | Nacre throughout | Nacre layers over a nucleus | None; a pearly coating |
| Surface feel | Slightly gritty against a tooth | Slightly gritty against a tooth | Smooth or glassy |
| Availability | Extremely rare | Widely available | Widely available |
| How it must be sold (US) | May be called pearl | Must say cultured | Must say imitation |
What is an imitation pearl?
An imitation pearl is a manufactured bead, usually glass, plastic or shell, coated with a pearly finish. Some high-quality imitations are convincing at a glance, especially in costume jewelry and vintage pieces, but they contain no nacre and are not pearls.
Imitation pearls can be attractive and inexpensive, and there is nothing wrong with buying them knowingly. The problem is when they are sold as real. With wear, the coating can chip or peel and reveal the bead underneath, while a real pearl's nacre goes all the way through its outer layers.
Names such as faux, simulated, glass pearl and shell pearl all describe imitations. The wider guide to simulants, synthetics and natural gems explains how these terms are used across gemstones.
Mother-of-pearl is a separate case. It is the nacre lining the inside of certain shells, cut into flat pieces for inlays, pendants and earrings. Mother-of-pearl jewelry is genuine shell material and is sold under its own name, but a round bead cut from shell and coated to look like a pearl is still an imitation. If a description says shell pearl, it is not a cultured pearl.
Read the Label
In the US, the word pearl on its own should mean a natural pearl. Cultured pearls should be described as cultured, and imitations as imitation or a similar word, with equal prominence.
How can you tell real pearls from fake pearls?
The tooth test. Gently rub the pearl along the edge of your front teeth. Natural and cultured pearls usually feel slightly gritty because of the fine layered structure of nacre. Imitations usually feel smooth or glassy. Use light pressure and only on pieces you own.
Look closely. Real pearls show small surface irregularities and slight variations from pearl to pearl in a strand. Imitations often look too perfect and identical. Under magnification, check the drill holes: chipping or peeling coating around the hole points to an imitation.
Feel the weight and temperature. Real pearls feel cool to the touch at first and have a satisfying weight. Plastic imitations feel light and warm up quickly, although glass imitations can feel cool and heavy, so this test alone is not conclusive.
Ask for documentation. For valuable pieces, a gemological laboratory report confirms whether pearls are natural, cultured or imitation. A reputable seller states the pearl type clearly. The complete pearl buying guide covers what to look for when buying.
Quick check
Slight grit against a tooth, small natural variations, clean drill holes, cool to the touch and a clear cultured or natural description from the seller.
Which type of pearl should you buy?
For almost everyone, cultured pearls are the right choice. They are real pearls with genuine nacre, they are available in every size, color and budget, and good-quality cultured pearls last for generations with simple care. Natural pearls are best left to collectors and antique buyers, and imitation pearls suit fashion jewelry rather than lasting gifts.
Within cultured pearls, freshwater pearls offer the best value, Akoya pearls offer the classic round white look, and South Sea and Tahitian pearls offer size and drama. Pearls are also the June birthstone, covered in the post on June's birthstone, and a popular gift; the jewelry gift guide for her has more ideas.
Whichever type you choose, buy from a seller who states clearly whether pearls are cultured, names the pearl type and describes the metal used in the setting. That clarity is the best protection against paying pearl prices for an imitation.
"Natural pearls form around a microscopic irritant in the bodies of certain mollusks."
GIA, Pearl gem overview
Further reading: 16 CFR 23.20, FTC Jewelry Guides. GIA describes cultured pearls as the result of the deliberate insertion of a bead or piece of tissue that the mollusk coats with nacre. Under the FTC Jewelry Guides, cultured and imitation pearls must be clearly described as such rather than sold simply as pearls.
In Short
1Natural pearls form by chance, cultured pearls are grown with human help and imitation pearls are coated beads.
2Natural and cultured pearls are real pearls made of nacre; imitations contain no nacre.
3Cultured pearls are the best choice for most buyers, and sellers must label cultured and imitation pearls clearly.
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Natural pearls form by chance, cultured pearls are real pearls grown with a little help, and imitation pearls are coated beads with no nacre. For lasting jewelry, cultured pearls offer the real thing at a fair price. Check that the seller names the pearl type clearly, and you will know exactly what you are buying. Every order ships free with a 30-day return policy.
Frequently Asked Questions
01
Are cultured pearls real pearls?
Cultured pearls are real pearls. They are made by living mollusks that coat an inserted bead or piece of tissue with nacre, the same material that forms natural pearls.
02
Are natural pearls more valuable than cultured pearls?
Natural pearls are usually far more valuable than cultured pearls of similar appearance because they are extremely rare. Most natural pearls on the market today are in antique jewelry.
03
Are freshwater pearls natural or cultured?
Freshwater pearls sold in jewelry today are almost always cultured. They are grown in freshwater mussels, usually from a piece of tissue rather than a bead.
04
How can you tell if pearls are fake?
Fake pearls usually feel smooth when rubbed gently against a tooth, while real pearls feel slightly gritty. Identical, flawless pearls and peeling coating near the drill holes also suggest imitations.
05
What are imitation pearls made of?
Imitation pearls are made of glass, plastic or shell beads coated with a pearly finish. They contain no nacre, so they are not pearls.
06
Do sellers have to say pearls are cultured?
Sellers in the US are expected under the FTC Jewelry Guides to describe cultured pearls as cultured and imitation pearls as imitation. The word pearl alone should mean a natural pearl.