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Natural vs cultured pearls

Both are real pearls grown inside a mollusk. A natural pearl forms with no human help; a cultured pearl starts when a person places a bead or tissue inside (FTC).

Natural pearls
vs
Cultured pearls
Natural pearlsCultured pearls
WaterFreshwater and saltwaterFreshwater and saltwater
MolluskMany speciesOysters and mussels
WhereHistorically worldwide; most natural pearl beds were depleted by overharvestingWorldwide
Typical sizeAnyAbout 2 to 16 mm
ShapesMostly irregularEvery shape
How it startsNone placed by peopleA bead, a piece of tissue, or both, placed by a person
Growing timeUnknown; forms on its ownMonths to years

The differences

  • Both are real pearls grown inside a mollusk. A natural pearl forms with no human help; a cultured pearl starts when a person places a bead or tissue inside (FTC).
  • Natural pearls are rare because natural pearl beds were overharvested; cultured pearls now dominate sales (GIA).
  • You cannot tell them apart by eye. GIA uses X-ray microradiography, and sometimes micro-CT, to see the internal structure.
  • Sellers must say a pearl is cultured: the FTC Jewelry Guides cover misuse of the word "pearl" and of terms like "natural" and "real".

More about natural pearls · More about cultured pearls · Compare looks in Pearl Studio

Frequently asked questions

What is the difference between natural and cultured pearls?

Both are real pearls grown inside a mollusk. A natural pearl forms with no human help; a cultured pearl starts when a person places a bead or tissue inside (FTC). Natural pearls are rare because natural pearl beds were overharvested; cultured pearls now dominate sales (GIA).

Facts from GIA: Differences between pearl types. Checked October 22, 2026.