American Pearl · Pearl Guide

A Brief History of Pearls: South Sea Pearl Processing

The short answer

South Sea pearls need almost no processing. Their thick nacre means they are not bleached, dyed or enhanced; they are simply cleaned and lightly polished. A fine cultured South Sea pearl looks identical to a natural pearl, and only an X-ray can tell them apart.

Reviewed by American Pearl’s pearl specialists · Updated October 2026

	A brief history of pearls		SOUTH SEA PEARL PROCESSING South Sea pearls have extremely thick nacre, which adds to their durability and strength. Because fine South Sea cultured pearls are identical to natural pearls on the outside, the only way to tell the difference between the two types is by examining an X-ray. Minimal Processing for South Sea Pearls Because South Sea pearls don't need to be treated, dyed or enhanced in any way, they only require minimal processing. Usually, only cleaning and slight polishing are necessary to bring out their natural beauty and glow. Experts carefully examine each pearl before sending it for processing. The Natural Beauty of South Sea Pearls Unlike other types of pearls, these large, lustrous gems take quite some time to cultivate - between 2 and 3 years - and during that time, a very thick layer of nacre develops. Usually, pearls with thick nacre create a beautiful luster.
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South Sea pearl processing: common questions

Are South Sea pearls treated or dyed?

Fine South Sea pearls are not treated or dyed. They are cleaned and lightly polished to bring out their natural luster. Be cautious of very inexpensive “golden” pearls, which may be dyed.

How can you tell a natural pearl from a cultured South Sea pearl?

You cannot tell a natural pearl from a cultured South Sea pearl from the outside. Only an X-ray shows the bead nucleus inside a cultured pearl.

Are South Sea pearls durable?

Yes, South Sea pearls are durable: their thick nacre makes them strong and long-lasting with normal care.