The single most common misconception in our business, cleared up.

People ask us this constantly, usually a little embarrassed: "Are these real pearls, or cultured?"

The question contains its own mistake. Cultured pearls are real pearls. The opposite of cultured is not real — it is imitation, which is something else entirely.

Three categories, not two

Only the third one is fake. And it is the only one that is not a pearl at all.

What actually happens inside the shell

A mollusk builds a pearl as a defense. Something lodges inside it that will not leave, so the animal coats the intruder in nacre — microscopic layers of aragonite crystal bound with a protein called conchiolin. Layer over layer over layer, for years. That layered structure is what makes a pearl glow from within rather than shine off the surface.

In a cultured pearl, a trained technician performs a small surgical implantation: a bead nucleus, a piece of donor mantle tissue, or both. Then the mollusk is returned to the water and left alone.

Everything after that moment is the animal's own work. Nobody makes a pearl. The mollusk does, on its own schedule, and the grower's job is mostly patience and clean water.

Why natural pearls essentially vanished

Before culturing, finding a pearl meant opening wild oysters and hoping. The yield was brutal — the overwhelming majority of shells held nothing at all. Natural pearl strands were among the most expensive objects on earth, which is why they appear on royalty in every museum portrait.

Pearl culturing was developed in Japan in the early 1900s, and within a few decades it had transformed the trade. Wild pearl beds had already been depleted by centuries of harvesting, and culturing arrived just as they gave out.

Today, natural pearls surface mainly at auction, priced as antiques rather than as jewelry. A natural strand is a collector's object. A cultured strand is something you wear.

How to tell a pearl from an imitation

Four tests, from easiest to most reliable:

1. Temperature. Nacre is cool against the skin for a moment before it warms. Plastic is room temperature immediately.
2. The tooth test. Rub the pearl very gently along the edge of a front tooth. Nacre feels faintly gritty — that is the crystal structure. Imitation feels glassy and smooth. Trade people have used this for a century.
3. Look at the drill hole. On a real pearl the hole is clean and you may see the nacre layers. On an imitation, coating often chips or peels around the opening.
4. Look at the strand as a whole. Real pearls vary — slightly in size, slightly in shape, slightly in overtone. A strand where every bead is identical is usually manufactured.

That last point is worth sitting with. Minor variation is evidence of authenticity, not a defect. A hand-matched strand is matched to look harmonious, not cloned.

Bead-nucleated and tissue-nucleated

Within cultured pearls there is a second distinction that affects value.

Saltwater pearls — Akoya, Tahitian, South Sea — are almost always bead-nucleated. A round shell bead is implanted, and the mollusk coats it. Nacre thickness is therefore a real quality question: thin nacre over a bead will not have the depth of luster, and will not last as well.

Freshwater pearls are usually tissue-nucleated, meaning there is no bead at the center — the pearl is nacre nearly all the way through. This is why good freshwater pearls have become genuinely competitive with Akoya, and why the old assumption that freshwater means lesser no longer holds.

Nacre is one of the seven pearl value factors GIA uses to describe quality, alongside size, shape, color, luster, surface, and matching. We go through all seven in what AAA pearl grading actually means.

What the law requires a seller to say

Under the FTC's Jewelry Guides, a seller in the United States may not call an imitation a "pearl" without qualification, and must disclose when a pearl is cultured. If a listing says "pearl necklace" with no further detail and the price looks impossible, ask the direct question: natural, cultured, or imitation? An honest seller answers immediately.

Every pearl we sell is cultured, and we say so on every page. We have been importing pearl direct from the farms for four decades — there is nothing to be coy about.

So which should you buy?

Unless you are collecting antiques, buy cultured. It is the same material, grown by the same animal, and it is what nearly every fine pearl on earth has been for the past hundred years.

Then judge it on the things that actually vary: luster first, surface second, then shape, color, and match.

Frequently asked questions

Are cultured pearls real pearls?

Yes. A cultured pearl grows inside a living mollusk from the same nacre, by the same process, as a natural pearl. The only difference is that a technician started it by introducing a nucleus. Imitation pearls, made of glass or plastic, are the only fake ones.

What is the difference between natural and cultured pearls?

Natural pearls form by chance, without human help, and are now extremely rare, found mostly in antique jewelry and at auction. Cultured pearls begin with a technician introducing a nucleus, and the mollusk does the rest. Effectively all fine pearls sold today are cultured.

How can you tell if a pearl is real?

Rub it gently along the edge of a front tooth: real nacre feels faintly gritty, while an imitation feels smooth and glassy. Real pearls also feel cool at first, show slight variation across a strand, and have clean drill holes without peeling coating.

Are freshwater pearls real?

Yes. Freshwater pearls are genuine cultured pearls grown in mussels. Most are tissue-nucleated, which means they are nacre nearly all the way through.

Next: which pearl is right for me, or browse the pearl collection.

Enchanting. Intriguing. Refined.

ISAAC WESTMAN® · New York · Founded 1982