Buying South Sea and Tahitian pearls in Sydney: size, lustre and surface
A Sydney floor sits close to the farms. How the two great pearls are grown, graded and priced, and what to check at the booth before a strand ships.
The year ends near where the pearls begin. A Sydney floor in October sits closer to production than almost anything else on a jewelry calendar: the white pearl in the case was most likely grown off the Western Australian coast, in Indonesia or in the Philippines, and the dark one beside it in a French Polynesian lagoon. More often than at a trading hub you are buying from the grower, so a question about how a pearl was produced has someone present who knows.
It also means two products are sharing one word. South Sea pearls come from Pinctada maxima, the largest of the pearl oysters, in white, silver and gold. Tahitian pearls come from Pinctada margaritifera, and run grey to near black with overtones that carry much of their price. They are graded in different vocabularies, under different rules, with different work left to the buyer.
Two oysters, and two different trades behind them
Australia's industry is the unusual one: a substantial share of its Pinctada maxima is still wild shell, taken by divers under a state-managed quota and then grown out on farm, with Broome at the centre of it. Indonesia and the Philippines are hatchery-based and grow most of the golden material, where the colour is the gold-lipped variety of the same species, not a treatment. Tahitian pearls are a lagoon business across the Tuamotu and Gambier atolls, and French Polynesia regulates what may be exported. Australian goods tend to arrive graded and matched in runs; Tahitian goods arrive varied, with the sorting left to you.
Size is the first price step, and the steps are not even
These pearls are measured in millimetres and sold by the piece, not by weight. The commercial band for South Sea runs roughly nine to sixteen millimetres, with larger material priced as scarce; Tahitian sits smaller, mostly eight to fourteen. The step from one millimetre to the next is not a straight line, because a round pearl two millimetres larger spent longer in the shell, failed more often, and leaves a far smaller pool to match a strand from. Fix the millimetre before you fall for a particular pearl.
Lustre, and why it looks softer than an Akoya
Lustre here comes from thick nacre laid down over years, and it reads as a deep satin glow rather than the hard mirror of a well finished Akoya. Softer is not weaker. The test is the same either way: hold the pearl so a light source reflects in it and look at the edge of that reflection. If the boundary is sharp enough that you can nearly read the shape of the window in it, the lustre is there; if it smears, no amount of size or colour repairs it. Judge it in daylight rather than under the booth's warm spots, then again under your own case lighting.
Surface, shape, and whose grade you are being quoted
French Polynesia classifies exported pearls by surface quality in letters, from A downward as imperfection becomes more extensive and deeper, and enforces a minimum nacre thickness, checked by X-ray, before goods may leave. Australia has no equivalent government scale: its growers grade to their own published systems, consistent within one company and not interchangeable between two. So the question is never what grade a pearl is, but whose grade that is and what the letter excludes. Ask for the scale in writing and keep it with the invoice.
- Nacre at the drill hole, looking for a visible bead or a chalky line. Thin nacre dulls, blinks or peels in wear, and it is the one fault that worsens.
- Shape named honestly rather than rounded up a category: round, semi-round, button, drop, oval, baroque and circled. Circled goods are legitimate and should be priced as such.
- Body colour and overtone described separately, since the overtone is where a Tahitian peacock earns its premium.
- Matching judged across the whole strand in one hand, because the eye finds the one soft pearl in forty before the thirty-nine good ones.
- Bleaching, dyeing or irradiation disclosed on the invoice, not in conversation. Dark does not mean treated, and treated does not reliably look treated.
Two practical notes. The fancy browns sold as chocolate pearls are usually treated, and a straightforward seller will say so and price them that way. And settle the tax before the invoice is written: Australia charges ten per cent goods and services tax, an export sale can be free of it when the goods leave inside the window the tax office allows, and goods you carry out in your own baggage fall under the airport refund scheme instead. Choosing the right route at the booth beats reclaiming money later.
A pearl is a surface with a light inside it. The rest of the grading sheet only describes how much of that surface survived.
Valumira's twelfth and closing show runs 15 to 17 October 2027 at ICC Sydney on Darling Drive, with opal from Lightning Ridge, South Sea pearl from Broome and the independent makers of Australia and New Zealand as its focus. Friday is trade only; Saturday and Sunday are open to the public. Arrive with your millimetre, your shape and your lustre threshold already decided, and a loupe you are willing to use at the drill hole, because on this floor the sorting is the buying.