Not every pearl comes out of a shell the same way, and the difference between the three kinds — natural, cultured and imitation — is the first thing anyone buying pearls should understand, because it drives practically all of the value.
Natural pearls
A natural pearl forms without any human intervention: a parasite or injury settles inside certain molluscs, and the animal wraps the irritant in layer upon layer of nacre. Natural pearls are rare today and command collector prices; most antique pearl jewellery predates culturing.
Cultured pearls
A cultured pearl is grown the same way — nacre around an irritant — but a technician starts the process by placing the nucleus. The mollusc does the rest over months or years. Nearly every pearl sold today is cultured, whether saltwater (Akoya, South Sea, Tahitian) or freshwater. Cultured pearls are real pearls; the word refers to how the process started, not to fakeness.
Imitations
Imitation pearls are manufactured beads — glass, plastic or shell — coated with a pearlescent finish. The classic “tooth test” (real nacre feels gritty against the teeth) separates most imitations, though some modern imitations pass casual checks, which is why professional gem testing exists.
Learning the pearl trade
Pearls and their imitations are covered in the gem-trade curriculum at JDMIS — see the GT100 gem and jewellery trade course — and the school’s free pearl masterclass is a good starting point.
Frequently asked questions
What is the difference between natural and cultured pearls?
A natural pearl forms without human intervention when a parasite or injury settles inside a mollusc and the animal wraps it in nacre. A cultured pearl grows the same way, but a technician starts the process by placing the nucleus. Nearly every pearl sold today is cultured.
Are cultured pearls real pearls?
Yes. Cultured refers to how the process started, not to fakeness - the mollusc lays down real nacre over months or years, whether saltwater (Akoya, South Sea, Tahitian) or freshwater.
How can you tell imitation pearls?
Imitations are manufactured beads - glass, plastic or shell - coated with a pearlescent finish. The tooth test (real nacre feels gritty) separates most, but some modern imitations pass casual checks, which is why professional gem testing exists.