A client came in recently holding two strands of white pearls. One she had bought overseas for a few hundred dollars. The other was her grandmother's. She wanted to know why they looked so different when, to her, they were both just white pearls.
We put them side by side under the window light. The difference took about three seconds to see and considerably longer to explain. That conversation is this article.
A different oyster entirely
Most pearls on the market come from small molluscs. Akoya pearls from Japan grow in an oyster roughly the size of a coaster. Freshwater pearls grow in mussels, often many at a time in a single shell.
Australian South Sea pearls come from Pinctada maxima, the silver-lipped oyster — the largest pearl oyster in the world, reaching the size of a dinner plate. One oyster, one pearl at a time.
That size is the whole story. A bigger oyster grows a bigger pearl, and it lays down nacre — the crystalline material a pearl is actually made of — far more generously.
Nacre is what you are buying
A cultured pearl begins with a bead nucleus implanted in the oyster. The oyster coats it in layer after layer of nacre. Everything you find beautiful about a pearl — the glow, the depth, the way light seems to come from inside it rather than off it — is that nacre.
Akoya pearls are typically cultured for around ten to eighteen months and carry perhaps 0.4mm of nacre. Australian South Sea pearls stay in the oyster for two years or more and commonly carry 2mm or more. Several times the depth.
This is not an abstraction. Thin nacre wears through. Within a decade or two of regular wear, a thin-nacre pearl can go chalky or begin to show the bead beneath. A well-nacred Australian pearl can be worn for a lifetime and passed on — which is why the grandmother's strand still looked alive.
Where they come from
Australia's pearling waters run along the Kimberley coast of Western Australia, centred on Broome, with some production in the Northern Territory. These are some of the cleanest, least industrialised waters producing pearls anywhere.
Australia is also unusual in one respect: a meaningful share of its oysters are still wild-caught by divers, under a strictly managed quota, rather than entirely hatchery-raised. The industry is one of the most tightly regulated wild fisheries in the world, because the growers have an obvious commercial interest in the water staying clean — a stressed oyster produces a poor pearl.
The practical result for you is a pearl with a genuinely traceable origin. If provenance matters to you, Australian South Sea pearls are one of the easier things in the jewellery world to trace.
What to look at, in order
There is no single universal grading system for pearls the way there is for diamonds. Sellers use their own scales, and an "AAA" from one company means nothing about an "AAA" from another. Judge the pearl itself, in this order.
Lustre, first and always. Hold the pearl under a light and look for the reflection. On a fine pearl the reflection is sharp, almost mirror-like, with a sense of depth behind it. On a poor pearl it is soft and milky. Lustre is the single largest driver of value and the hardest thing to fake. If a pearl does not have it, nothing else matters.
Surface. Pearls are grown, not manufactured, and small marks are normal. What matters is whether the marks are visible at conversation distance and whether they sit somewhere the setting can hide. A minor blemish that will face the neck is not worth paying to avoid.
Shape. Perfectly round commands the highest prices because it is the rarest. But drops, ovals, buttons and baroques can be far more interesting to wear, and they cost significantly less. Some of the most striking pieces we design use baroques precisely because no two are alike.
Size. Australian South Sea pearls typically run 9mm to 16mm, with exceptional stones reaching 20mm. Price does not rise in a straight line with size — it accelerates sharply, because large oysters that survive a long culture period are rare.
Colour. White with rosé or silver overtones is the classic Australian look. Silver, cream and golden also occur. Overtone is subtle and best judged against your own skin, not against a white tray.
Matching, for strands. A strand requires many pearls that agree with each other in lustre, colour, size and surface. Assembling one can take years of sorting. This is why a matched strand costs far more than its individual pearls would suggest, and it is legitimate cost, not markup.
A note on the price gap
When someone compares a $200 freshwater strand to a $5,000 Australian strand, they are not comparing two versions of the same thing. They are comparing a product where dozens grow in one mussel over months, to one where a single pearl grows in a single large oyster over years, in a regulated wild fishery, and is then matched against hundreds of others.
Freshwater pearls have their place — we use them, and they can be lovely. But they are a different product, and the honest thing is to say so rather than to pretend the gap is about branding.
Caring for them
Pearls are soft — around 2.5 to 4 on the Mohs scale — and nacre is vulnerable to acid. A few habits will keep them well for decades:
- Last on, first off. Put pearls on after perfume, hairspray and makeup; take them off before anything else.
- Wipe after wearing. A soft dry cloth removes skin oils and perspiration, which are mildly acidic.
- Never ultrasonic, never steam, never chemical cleaners. These strip nacre and can loosen the silk.
- Store flat and separately, not in a jewellery box where harder stones can scratch them. Avoid airtight plastic — nacre needs a little humidity or it can dry and craze.
- Restring every year or two if worn regularly. Silk stretches and absorbs oils. It costs very little; a broken strand in a car park costs a great deal.
And the best thing for pearls is genuinely to wear them. They do better against skin than in a drawer.
Come and see the difference
Lustre does not photograph. Every pearl image you see online has been lit and retouched, and the gap between a good pearl and a remarkable one simply disappears in a JPEG.
At our Pitt Street studio we keep loose Australian South Sea pearls and finished pieces that you can compare side by side, in daylight, with a gemologist explaining what you are looking at. If you have inherited a strand and want to know what you have, or want it restrung or redesigned into something you will actually wear, bring it in — that is some of the most satisfying work we do.
TayaM Jewellery — 321 Pitt Street, Sydney CBD. Australian South Sea pearl specialists. Bespoke design and in-house gemological expertise.
