Almost every guide compares freshwater, baroque and keshi pearls as though they were three options on a menu. They are not. They are three different kinds of word, and once that is clear the subject stops being confusing.
| Term | What it describes | Example |
|---|---|---|
| Freshwater | Where the pearl grew | A mussel in a river or lake |
| Baroque | What shape it is | Any pearl that is not round |
| Keshi | How it formed | Grown with no nucleus inside |
A single pearl can be all three at once. Most of the interesting ones are.
What is a freshwater pearl?
A freshwater pearl is one grown in a mussel in a river or lake, rather than an oyster in the sea. Most come from China, and they make up the overwhelming majority of pearls in jewellery today.
The technical difference matters more than it sounds. Saltwater pearls such as Akoya, Tahitian and South Sea are almost always bead-nucleated: a round shell bead is implanted and the mollusc coats it in nacre. The bead is what makes them round.
Freshwater pearls are usually tissue-nucleated instead. A small piece of mantle tissue is inserted, with no bead, and the mussel builds the pearl outward from nothing. That means a freshwater pearl is solid nacre throughout, where a saltwater pearl is a thin nacre layer over a bead.
Two consequences follow. Freshwater pearls are more durable, because there is no thin coating to wear through. And they are rarely round, because without a bead there is no template.
Why are most freshwater pearls baroque?
Because baroque simply means not round, and without a bead nucleus a pearl has nothing to be round around. Over 90% of freshwater pearls emerge in irregular shapes.
The word comes from the Portuguese barroco, meaning an irregular pearl, which later gave its name to the artistic period.
Baroque shapes have their own vocabulary in the trade: coin, potato, rice, stick, twin and drop. None of these is a defect. Round is simply the hardest shape to achieve, which is why it costs more.
A baroque pearl is not a failed round pearl. It is the normal outcome of the way freshwater pearls are grown.
What is a keshi pearl?
A keshi pearl is one that formed with no nucleus at all, as a by-product of the culturing process. The mollusc rejected the implanted bead but continued producing nacre, so the resulting pearl is entirely nacre with nothing inside it.
Keshi is Japanese for poppy seed, describing the tiny accidental pearls that once turned up in Akoya oysters.
Because they build outward with no template, keshi pearls are always irregular, usually small, and unusually lustrous. Solid nacre with no bead beneath it produces a softer, deeper glow rather than the sharp mirror-like reflection of a bead-nucleated pearl. Most are under 10mm.
A note on mislabelling
A great deal of what is sold online as keshi is ordinary freshwater baroque pearl.
This is a recognised issue in the trade. Because tissue-nucleated freshwater pearls are also solid nacre and also irregular, they resemble keshi closely enough that the more desirable name gets applied loosely. Genuine keshi are by-products produced in small quantities and priced accordingly.
Distinguishing them reliably is not something that can be done by eye alone. We would rather describe our pearls accurately than reach for the more impressive word: if a piece is freshwater baroque, that is what we call it.
How to judge a pearl
Four things, in this order.
Lustre comes first. Hold the pearl under a light and look for a clear, sharp reflection rather than a chalky glow. This matters more than size or shape.
Surface next. Some marking is normal and expected in baroque pearls; heavy pitting is not.
Nacre thickness third. On a bead-nucleated pearl, thin nacre eventually wears through. Solid-nacre pearls do not have this problem.
Shape last. A small pearl with excellent lustre looks more expensive than a large chalky one.
Which should you choose?
For everyday wear and value, freshwater baroque: solid nacre, durable, endlessly varied, and the most affordable genuine pearl there is.
For something unusual, keshi, provided it can be verified as genuinely keshi.
For a classic formal look, round pearls, which will almost always be saltwater and priced accordingly.
You can see our current pieces in the pearl necklaces collection.
Frequently asked questions
What is the difference between baroque and keshi pearls?
Baroque describes shape: any pearl that is not round. Keshi describes formation: a pearl grown with no nucleus inside it. Most keshi pearls are baroque in shape, but most baroque pearls are not keshi.
Are freshwater pearls real pearls?
Yes. Freshwater cultured pearls grow inside living mussels and are genuine pearls. Cultured means human-assisted, not artificial.
Why are baroque pearls less expensive than round ones?
Because round is rare. Perfectly round pearls occur in only a small fraction of any harvest, so they command a premium. Baroque pearls are the normal outcome rather than an inferior one.
Are keshi pearls valuable?
Comparable in size and lustre, keshi usually cost more than baroque pearls, because they are accidental by-products produced in small numbers and consist entirely of nacre. However, a good deal of material sold as keshi is ordinary freshwater baroque, so accurate description matters more than the label.
Are freshwater pearls durable?
More durable than most people expect. Tissue-nucleated freshwater pearls are solid nacre throughout, so there is no thin coating to wear away, unlike bead-nucleated saltwater pearls.
What matters most when buying pearls?
Lustre. A small pearl with sharp, clear reflections looks better than a large one with a chalky surface. Shape matters least.
Can you wear pearls every day?
Yes, and it suits them: skin contact helps keep nacre from drying out. Pearls are soft, around 2.5 to 4.5 on the Mohs scale, so put them on after perfume and cosmetics and take them off before undressing, then wipe them with a soft cloth.
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