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Origin · Freshwater and saltwater

Natural pearls

Pearls that formed inside a mollusk with no human help. Rare today because natural pearl beds were overharvested, and the only reliable way to confirm one is a lab test with X-rays.

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By The Perfect Pearls editors · Updated · How we check our facts

Illustration of a typical natural pearl. Move your pointer to turn the light.

At a glance

WaterFreshwater and saltwater
MolluskMany species
WhereHistorically worldwide; most natural pearl beds were depleted by overharvesting
Typical sizeAny
ShapesMostly irregular
How it startsNone placed by people
Growing timeUnknown; forms on its own
WhiteCreamPinkGoldenCharcoal

A natural pearl forms inside a mollusk with no help from people. The FTC defines it as a concretion of layered calcium carbonate and organic material that forms in a mollusk in response to an irritant or an abnormal physiological condition, without human involvement (16 CFR 23.19). GIA describes natural pearls forming around a microscopic irritant.

Why natural pearls are rare

Overharvesting depleted natural pearl beds, and cultured pearls now dominate sales (GIA). Natural pearls are still found, but you should assume any pearl is cultured unless a lab report says otherwise.

How labs tell natural from cultured

You cannot tell by looking. GIA X-rays every pearl it tests. Microradiography is, in GIA's words, the most reliable non-destructive way of seeing a pearl's internal structure. Cultured pearls show features such as a bead nucleus, voids or linear structures that natural pearls usually lack; even so, the separation is not always straightforward, and micro-CT scanning is sometimes needed (GIA).

More: how labs test pearls.

Famous natural pearls

  • La Peregrina, a natural pearl found in 1513 in the Pearl Islands of Panama, owned by Spanish kings and later by Elizabeth Taylor, sold at Christie's in December 2011 for more than $11 million. See famous pearls.
  • In 1917, Pierre Cartier traded a double strand of natural pearls for a mansion on Fifth Avenue in New York (GIA).

Non-nacreous natural pearls

Some natural pearls are not made of nacre at all. Conch, melo, quahog and some clam pearls have a porcelain-like surface, often with "flame" patterns. See conch pearls, melo pearls and quahog pearls.

What people paid for natural pearls

Real prices readers paid, not estimates. A figure appears only once at least 5 people have reported the same kind of piece, and we never show individual reports.

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Natural vs cultured pearls

Frequently asked questions

How can you tell if a pearl is natural?

Only a lab can tell reliably. GIA uses X-ray microradiography, and sometimes micro-CT, to see the internal structure.

Are natural pearls more valuable than cultured pearls?

Natural pearls are much rarer, and famous natural pearls have sold for millions, such as La Peregrina at more than $11 million in 2011. Value still depends on the individual pearl.

Questions from readers

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Sources

Checked October 22, 2026. How we check our facts.