On 16 November 2010, a single lot at Sotheby's Geneva brought the international gem trade to a standstill. A 24.78-carat emerald-cut diamond of Fancy Intense Pink colour and Type IIa classification sold for CHF 45,442,500 — equivalent to approximately US $46.16 million — to the London-based dealer and collector Laurence Graff. The hammer price established a new world record for any gemstone sold at auction, surpassing all previous benchmarks and signalling, with unmistakable clarity, the extraordinary premium that the market had come to place on large, gem-quality fancy pink diamonds. Graff subsequently renamed the stone the Graff Pink, and it entered the canon of landmark coloured diamonds alongside the Wittelsbach-Graff and the Pink Star as one of the defining transactions of the early twenty-first century.

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The Diamond

The Graff Pink is a cushion-cut diamond weighing 24.78 carats. Its colour grade, as certified by the Gemological Institute of America (GIA), is Fancy Intense Pink — a designation that places it among the most saturated and commercially desirable of all pink diamond colour grades, falling below only Fancy Vivid in the GIA colour-grading hierarchy. The stone is classified as Type IIa, the structural category defined by an absence of measurable nitrogen impurities in the crystal lattice. Type IIa diamonds are chemically the purest form of diamond and frequently exhibit exceptional optical transparency; they also account for the overwhelming majority of the world's most celebrated large pink diamonds, including the Pink Star and the Steinmetz Pink.

The precise origin of the rough from which the Graff Pink was cut is not publicly documented, though the world's most significant pink diamonds have historically emerged from the Argyle mine in Western Australia, from alluvial deposits in Brazil, and from certain Indian and African sources. The stone's provenance prior to the 2010 sale was not disclosed in detail by Sotheby's, which is not unusual for diamonds of this sensitivity.

The emerald cut — a stepped, rectangular or square form with truncated corners — is a demanding choice for a coloured diamond. Unlike the round brilliant or the cushion cut, the emerald cut does not rely on scintillation to mask colour; it presents the body colour of the stone in broad, open flashes. For a diamond of Fancy Intense Pink saturation, this is a calculated advantage: the large table facet and the step-cut pavilion allow the pink hue to read with exceptional directness and depth. The choice of cut thus amplifies rather than conceals the stone's primary attribute.

The Sale

Sotheby's Geneva has long served as one of the two principal venues — alongside Christie's Geneva — for the auction of exceptional coloured diamonds and coloured gemstones. The November 2010 sale took place at the Hotel Beau-Rivage, Geneva, the traditional setting for Sotheby's most important jewellery auctions in Switzerland. The Graff Pink was offered with a pre-sale estimate that Sotheby's declined to publish, a practice sometimes employed for lots of exceptional rarity where any estimate risks either understating the stone's value or dampening competitive bidding.

The final hammer price of approximately $46.16 million translated to a per-carat value of roughly $1.86 million — itself a record at the time for price per carat at auction for any gemstone. The buyer's premium, applied at Sotheby's standard rates, brought the total consideration to the figure widely reported in the trade press. Laurence Graff, whose firm Graff Diamonds had previously acquired the Wittelsbach Diamond at Christie's London in December 2008 for £16.4 million and recut it, was identified as the buyer immediately following the sale.

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Significance in the Coloured-Diamond Market

The 2010 sale of the Graff Pink occurred at a moment of accelerating institutional and private interest in fancy coloured diamonds as a category. Several converging factors underpinned the result:

• Supply constraint: The Argyle mine in the Kimberley region of Western Australia, which at that time supplied the majority of the world's pink diamonds, was already signalling finite reserves. The prospect of eventual mine closure — which came in November 2020 — concentrated collector attention on existing large stones of documented quality.
• GIA certification: The accompanying GIA report provided an internationally recognised, laboratory-verified statement of colour grade, clarity, and Type IIa classification. For a stone of this value, third-party certification from a trusted authority is not merely procedural; it is a prerequisite for competitive bidding at this level.
• Rarity of the colour grade: Fancy Intense Pink diamonds of more than 20 carats are among the rarest objects in the gem trade. The combination of size, colour saturation, and the optical purity associated with Type IIa classification placed the Graff Pink in a category with almost no direct comparables.
• Buyer profile: Laurence Graff's acquisition was consistent with a pattern of major dealers purchasing exceptional stones at auction for long-term retention and eventual private resale, rather than for immediate commercial turnover. Such acquisitions serve simultaneously as inventory, as marketing, and as a statement of market authority.

The record set in November 2010 was subsequently surpassed by later sales — most notably the Pink Star (59.60 carats, Fancy Vivid Pink, VVS2), which sold at Sotheby's Hong Kong in April 2017 for HK $553 million (approximately US $71.2 million) — but the Graff Pink sale remains a watershed moment. It was the first time any gemstone had crossed the $40 million threshold at auction, and it demonstrated conclusively that the market for exceptional fancy coloured diamonds operated on a different valuation logic from that governing white diamonds of comparable carat weight.

The Stone After the Sale

Following acquisition, the diamond was renamed the Graff Pink and entered the private holdings of Graff Diamonds. It has been exhibited on limited occasions and is regarded within the trade as one of the finest pink diamonds in private ownership. No subsequent public sale has been recorded. Graff Diamonds has not disclosed whether any modifications were made to the stone after acquisition, though the firm has a documented history — as with the Wittelsbach-Graff — of recutting acquired stones to improve colour grade or remove clarity characteristics, a practice that is commercially rational but not without controversy among historians of notable gems.

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Further Reading

• GIA Gems & Gemology — Fancy Colour Diamonds (gia.edu)
• GIA Coloured Diamond Grading System (gia.edu)