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Assembled · Saltwater

Mabe pearls

Half-round assembled cultured blister pearls: a thin nacre dome over a mother-of-pearl bead, filler and a mother-of-pearl base. Pretty and affordable, but fragile, so better for earrings and pendants than rings.

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

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

At a glance

WaterSaltwater
MolluskMostly Pteria penguin, grown in Japan
WhereMostly Japan
Typical sizeVaries (half-round)
ShapesHalf-round dome (blister)
How it startsA dome grown on the shell, then assembled
WhiteSilverSilvery blue

A mabe pearl is an assembled cultured blister pearl. Instead of a whole pearl, it is a dome grown on the inside of the shell and then built up in layers (GIA):

  1. A very thin shell of nacre on top
  2. A bead of mother-of-pearl
  3. A filler material
  4. A mother-of-pearl base

Most mabes are grown in Japan in Pteria penguin, a mollusk not normally used for whole pearls.

Wear them carefully

The filler gives the thin nacre top little support, which is why mabes are fragile, especially in rings (GIA). They suit earrings, pendants and brooches better than anything that gets knocked.

Blister pearls and shell blisters

A natural blister pearl is a whole pearl that left its pearl sac and fused to the shell; it has to be cut from the shell to be used. A shell blister is a bump on the inside of the shell, often shallow and sometimes hollow (GIA). A mabe is the cultured, assembled cousin of both.

Frequently asked questions

What is a mabe pearl?

An assembled cultured blister pearl: a thin nacre dome over a mother-of-pearl bead, a filler and a mother-of-pearl base (GIA).

Are mabe pearls durable?

Not very. The filler gives the thin nacre little support, so mabes are fragile, especially in rings.

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Sources

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