Where blue pearls come from
Rare blue akoya pearls have a silvery gray tone (GIA). Natural abalone pearls are often blue or green with strong iridescence, and Sea of Cortez pearls show blue among their overtones.
Pearl types with this color
- Akoya pearls: 6 to 9 mm; over 9 mm is larger and rarer
- Abalone pearls: saltwater
- Sea of Cortez pearls: About 7 to 11 mm (2001 to 2002 harvests)
- Mabe pearls: saltwater
Natural or treated?
Irradiation can give pearls a bluish gray tone (Jewelry Business). Ask whether a blue pearl is natural color and look for a lab report.
More on pearl treatments, or build this color yourself in Pearl Studio.
Pearls that come in this color

Frequently asked questions
Are blue pearls natural?
They can be. Rare blue akoya pearls have a silvery gray tone (GIA). Irradiation can give pearls a bluish gray tone (Jewelry Business).
Questions from readers
Question about Blue pearls? Ask it here. We answer the useful ones on this page.
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Sources
- GIA: Differences between pearl types
- GIA: An introduction to gem treatments
- Jewelry Business: Detecting pearl imitations and treatments
- GIA Lab Notes: Large natural pearls from Haliotis (abalone) species (Fall 2015)
- GIA Gems & Gemology: Cultured pearls from the Gulf of California, Mexico
Checked October 22, 2026.