How to recognize genuine Tahitian pearls?

A true treasure cultivated in the oysters of Polynesia (Pinctada margaritifera), the Tahitian pearl is renowned for its rarity, prestige and incomparable beauty.

Knowing how to distinguish natural Tahitian pearls from imitations is essential for making a wise and confident investment.

Pinctada Margaritifera

The black Tahitian pearl (“Poe Rava” in Polynesian), being created by a living organism, possesses its own DNA. It is therefore unique, and there is no other like it.

Why do we refer to it as a “living pearl”?

Technical note: the Tahitian pearl is not a living organism in the strict biological sense of the academic definition (it has no active metabolism once formed). However, it is described as “living” in traditional jewellery terminology because its organic material remains reactive: it evolves with its environment, feeds off contact with the skin which rehydrates its matrix, and can permanently lose its lustre if it is not worn and cared for. Jewellers even speak of a ‘dead’ pearl to describe one whose lustre has been permanently lost.

This terminology is recognised by Polynesian pearl farmers, by major international jewellery houses (Mikimoto, Tasaki, Wan Pearls) and recognised by the leading bodies GIA (Gemological Institute of America) and CIBJO (World Jewellery Confederation), which classify pearls as organic gems as opposed to mineral gems.

Due to their rarity and high value, certain imitation products are brought to market. These artificial pearls (usually made of ceramic, glass, plastic or composites), which are dyed and varnished, are perfect deceptions to the eye.

Criteria for recognising a natural Tahitian pearl

Its name

It must be clear: “Tahitian pearl” or “Black Tahitian Pearl”.

Its density, weight and temperature

A natural pearl will always be denser, heavier and cooler than an artificial one. By placing the pearl in the palm of your hand, you can assess these three criteria. Please note: a glass pearl will also pass this test.

Its lustre and orient

Like a mirror, its surface must perfectly reflect light (its brilliance). Like a prism, its orient allows it to display different hues depending on the light passing through it.

The lustre is the reflection of light through the different layers of mother-of-pearl (aragonite crystals). The finer and more numerous the layers, the greater the pearl’s lustre.

Nature offers a wide palette: dark grey, silver, deep green, peacock green, aubergine, pink, dark blue, light blue, champagne or deep yellow. Whatever its colour, it must vary with the light.

Its shape

There are various shapes: ringed, baroque, teardrop, button, near-round, round. The round shape is the most sought-after, and also the rarest: less than 2% of the harvest achieves this. These are the most valuable pieces on the market.

However, roundness alone is not enough to distinguish a natural pearl from an artificial one. The true sign can be seen on the surface: a Tahitian pearl, even if perfectly round, always retains natural micro-irregularities and a perceptible mother-of-pearl texture. An industrial imitation, on the other hand, has a uniformly smooth surface, without the slightest texture. Examine the pearl under a low-angle light: if no micro-texture appears, its natural origin is in doubt.

The tooth test

The thick mother-of-pearl layer guarantees the pearl’s quality and durability. Gently rub the pearl against the enamel of your tooth:

• Rough texture = natural Tahitian Pearl
• Smooth, slippery surface = imitation pearl

The foolproof method remains to consult a professional equipped with microscopes, X-rays and refractometers.

Our Tahitian pearls

At Honu Handmade Jewellery, every pearl is carefully selected and sourced directly from an accredited Polynesian pearl farm. They are always accompanied by a Guarantee and traceability for complete transparency.

To learn more with our expert guide

What you have just read is only a brief overview of the criteria that allow you to distinguish a natural pearl from an imitation.

I have created a comprehensive expert guide which brings together, in 24 pages, everything you need to know to recognise a natural Tahitian pearl: in-depth quality criteria, official classifications, natural colours, market pitfalls to avoid, care advice, as well as the legends surrounding them.

This guide is available to download for free.