After Argyle: A New Chapter for Natural Pink Diamonds

Few gemstones possess the distinction and cachet of a natural pink diamond. If you are drawn to their colour and rarity, we can source a stone for a private collection or create a bespoke piece around it. For acquisitions held as loose stones, secure custody can be arranged through our private-client sibling brand, Kent & Carington.

This month, the story of pink diamonds entered a new chapter.

On 1 October, Rio Tinto confirmed that the Argyle Pink Diamonds brand, its trademarks and the last remaining inventory from the Argyle mine have passed to British jeweller Boodles. Terms were not disclosed. It closes a chapter that began when mining ended at Argyle in November 2020, and it raises the question every collector should now be asking: where will the next fine pink diamond come from?

Argyle at a glance

What has changed?

For decades, Argyle's finest stones reached jewellers through Rio Tinto's invitation-only tenders. The remaining stock now sits with a single house.

Trade press also reports that the existing Argyle Atelier and Authorised Partner licences are expected to expire in December 2026. That would narrow the number of businesses able to trade under the Argyle name.

What we expect it to mean:

Argyle moves further out of reach

With the last stock held by one house and released sparingly inside finished high jewellery, a loose Argyle stone will be found only on the secondary market, and will be priced accordingly.

Demand will shift focus, and increase

Collectors who want a fine natural pink diamond will increasingly look to stones from sources other than Argyle. Because Argyle supplied more than 90% of the world's pink diamonds, stones from other mines are scarce in their own right. They are now the only source of newly mined pinks.

Pricing follows rarity

As more buyers compete for this very small supply, we expect the value of fine pinks from other sources to rise to reflect it, placing them among the most valuable stones in the market.

"These are our expectations rather than certainties; the supply is finite, but how the market prices it is not ours to promise."

Beyond Argyle

Argyle holds a remarkable place in the history of pink diamonds. However, its name is not the only starting point for an exceptional acquisition.

Exceptional pinks are also found in southern Africa, Tanzania, Brazil and Russia. They are coloured by the same natural process and graded by the GIA on the same scale, which describes the colour of the stone, not the mine it came from. Our focus is always on the individual stone: its quality, the character of its colour, and its provenance.

The auction record shows just how exceptional pinks from beyond Argyle can be:

• The Pink Star, 59.60 carats, mined in Africa, sold for $71.2 million in 2017. It remains the most expensive gemstone ever sold at auction.
• The Williamson Pink Star, 11.15 carats, from Tanzania, sold for $57.7 million in 2022, a world record price per carat for any gemstone.
• The Eternal Pink, from Botswana, sold for $34.8 million in 2023.

Argyle was known above all for small, intensely coloured stones; many of the largest fine pinks have come from elsewhere. For now, a pink from another source does not carry the premium attached to the Argyle name. As Argyle stones become harder to obtain, we expect that gap to narrow.

What makes a diamond pink?

Most coloured diamonds owe their colour to a trace element: boron for blue, nitrogen for yellow. Pink is different. The colour comes from the crystal structure itself being bent under immense pressure deep in the earth. Too little pressure and the stone stays colourless; too much and it turns brown.

That narrow window is why pinks are so rare. Research published in Nature Communications in 2023 dates Argyle's diamonds to around 1.3 billion years ago, carried to the surface as an ancient supercontinent broke apart. The mine went on to supply more than 90% of the world's pink diamonds, yet pinks were less than 1% of what it produced. No comparable source has been found since, which makes the pinks still being mined elsewhere very few indeed.

The case for a place in your collection

A long record

The Fancy Color Research Foundation's index shows pink diamond prices up 389.8% since 2005, against 239.5% for blues and 47% for yellows.

Wealth you can wear

A fine coloured diamond is tangible, portable and private. It can be enjoyed for a lifetime before it passes to the next generation.

Colour before carat

With fancy coloured diamonds, size is not the deciding factor in price; colour intensity and clarity most often are. Compare a yellow and a pink graded to the same colour intensity and clarity: yellows command a high price, yet a pink a quarter of the size can command nearly twice as much.

That does not make other fancy coloured diamonds a lesser choice for an acquisition portfolio. They serve a different market and a different purpose, which we will explore in a future article.

A private conversation

If you would like to explore sourcing a certified pink diamond from beyond Argyle, or another fancy coloured stone, whether to hold or as the heart of a bespoke piece, we would be delighted to talk.

Arrange a consultation or call us on (+44) 0113 5381820.

With warm regards,

Sources and important information

Sources: Rio Tinto (1 October 2026); IDEX Online; Jeweller Magazine; Fancy Color Research Foundation, Q2 2026 index, via JCK and Rapaport; Sotheby's; GIA; Nature Communications (2023).

This article is for general information only and is not financial or investment advice. Diamonds are not a regulated investment. Their value can fall as well as rise, past performance is not a guide to future performance, and stones may take time to sell.