You can judge a pearl strand in about thirty seconds without any equipment, using four things: lustre, surface, shape and matching. Lustre is the one that actually decides whether a piece looks expensive, and it is the one most product photos hide.
1. Lustre — the reflection, not the shine
Lustre is how sharply a pearl reflects light. Hold the strand under a normal ceiling light and look at the highlight on each pearl:
- Excellent: the reflection is bright and crisp, almost mirror-like, and you can see the light source’s shape in it.
- Good: bright, but the edges of the reflection are slightly soft.
- Weak: the surface looks milky or chalky. The pearl is still white, it just does not reflect.
Lustre comes from nacre thickness and how evenly the layers were deposited. It is the single best predictor of how a piece will look in five years, because thin nacre dulls and eventually flakes.
2. Surface — how clean is clean enough
Every natural pearl has some surface character. Spots, small bumps and faint rings are normal and, at a sensible price, expected. What matters is whether they are visible at conversation distance.
The practical test: hold the strand at arm’s length. If you cannot see the marks from there, nobody else will either. If a pearl has a visible pit or a crack that catches a fingernail, that is a defect, not character.
3. Shape — roundness is a price, not a quality
Round pearls command the highest prices because they are the rarest, not because they are better. Off-round and near-round freshwater pearls are the same material at a fraction of the cost, and slightly oval pearls are often more flattering on the neck because they sit against the skin rather than rolling.
Baroque pearls take this to the other end: the irregular shape is the design. A well-matched baroque strand with strong lustre is a more interesting piece than a dull round one at the same price.
4. Matching — the quiet sign of a good strand
Matching is whether the pearls on one strand agree with each other: consistent size, consistent colour overtone, consistent lustre. Poor matching is easiest to see in the overtone — a strand where some pearls lean pink and others lean cream looks assembled rather than chosen.
Check it by laying the strand flat and looking along it, not at individual pearls.
What to prioritise on a budget
If you have to trade one thing off, trade shape. Buy the best lustre you can afford in an off-round or baroque pearl rather than a round pearl with weak lustre. The round one will look cheaper on the neck and will dull faster.
Second priority is surface at arm’s length. Third is size, which mostly changes the register rather than the quality.
Frequently Asked Questions
What is nacre and why does it matter?
Nacre is the layered material a pearl is made of. Thicker nacre means sharper lustre and a longer life. Thin nacre over a large bead is the most common reason a cheap strand goes dull.
Are freshwater pearls real pearls?
Yes. They are genuine pearls grown in freshwater mussels, mostly tissue-nucleated, which is why they are largely nacre all the way through and why they are more affordable than saltwater rounds.
Do baroque pearls chip more easily?
No. Nacre hardness is the same; the irregular shape simply means the drill holes and edges vary more. Check the drilling, not the shape.
How can I test lustre in a product photo?
Look at the highlight. If the photo shows a sharp bright spot on each pearl, lustre is good. If the whole strand is evenly white with no distinct highlight, the photo is probably flattering a chalky surface.
Should pearls feel gritty?
Gently rubbed against a tooth, a real pearl feels slightly gritty; glass and plastic feel smooth. It is a reliable quick check, though not one to do on jewellery that is not yours.
Why does one strand cost three times another?
Usually roundness and matching, then size. Lustre differences are real but smaller — which is exactly why shape is the first thing worth compromising on.
How should I store pearls?
Flat, in a soft cloth pouch, away from harder jewellery. Never hang a strand for years: the silk stretches and the knots loosen.
Do pearls need restringing?
Yes, every one to two years with regular wear. Silk stretches and collects oils; restringing is cheap insurance against losing the strand on the pavement.
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