A remarkable pink diamond, hidden from public view for more than 70 years, is preparing to take centre stage at Christie’s Magnificent Jewels auction in Geneva.
Some diamonds stand apart not simply for their size or beauty, but for their rarity, craftsmanship and extraordinary history. The Bulgari Pink is one such stone. Weighing an impressive 24.00 carats, this Fancy Intense Pink diamond is expected to attract international attention when it makes its public auction debut on 10 November 2026.
Created as a ring by the renowned Italian jewellery house Bulgari, the diamond has remained in the private collection of a distinguished European noble family for more than seven decades. It has never previously been offered at auction, adding a significant element of rarity to an already exceptional gemstone.
An Extraordinary Diamond with a Remarkable History
According to the family history, the rough diamond was acquired in India during the 1950s before being entrusted to Bulgari’s Roman atelier. There, it was fashioned into its elegant rectangular step cut, commonly known as an emerald cut.
The decision to use a step cut is particularly significant. Unlike brilliant cuts, which are designed to maximise sparkle through numerous facets, an emerald cut presents broad, open facets that showcase a diamond’s colour, transparency and proportions. It demands exceptional cutting precision, as the stone’s characteristics are exposed rather than concealed by intense scintillation.
The diamond’s Fancy Intense Pink colour grade places it among the highly sought-after category of naturally coloured pink diamonds. Achieving such a rich colour in a stone of 24 carats is an exceptional geological occurrence, making the combination of size, colour and cut particularly noteworthy.
The Significance of Type IIa Classification
The Bulgari Pink is also classified as a Type IIa diamond, a category distinguished by its exceptionally low nitrogen content. Type IIa diamonds represent a small proportion of gem-quality diamonds and are often associated with outstanding transparency.
In pink diamonds, the colour is generally attributed to distortions in the diamond’s crystal structure rather than conventional colouring impurities. The precise geological processes responsible for these distortions remain an important area of scientific interest.
For diamond specialists, this combination of natural colour, substantial carat weight and Type IIa classification makes the Bulgari Pink a particularly compelling example of the extraordinary diversity found in natural diamonds.
Christie’s Geneva Auction: A US$12–18 Million Estimate
Christie’s will offer the Bulgari Pink as a leading lot in its Magnificent Jewels auction at the Four Seasons Hotel des Bergues in Geneva on 10 November 2026.
The diamond carries a pre-sale estimate of CHF 10 million to CHF 15 million, equivalent to approximately US$12 million to US$18 million. Public viewing is scheduled from 5 to 10 November, giving collectors and jewellery enthusiasts an opportunity to examine the historic stone before the sale.
Its uninterrupted family provenance, prestigious jewellery-house origins and decades of privacy are expected to contribute to its appeal among international collectors.
Why Exceptional Pink Diamonds Matter
Natural pink diamonds occupy a distinctive position in the world of fine gemstones. Their appeal extends beyond traditional considerations such as carat weight, colour and clarity. Geological rarity, cutting expertise, documented history and the reputation of the jewellery house can all influence a stone’s significance in the international market.
The Bulgari Pink brings these elements together in a single jewel. Its appearance at auction also highlights the enduring interest in exceptional natural diamonds at a time when consumers have more choice than ever between natural and laboratory-grown stones.
Although laboratory-grown diamonds can offer impressive size and visual qualities, natural diamonds have a geological origin and formation history that cannot be replicated through laboratory production. For collectors seeking a rare natural gemstone with a distinguished provenance, these characteristics remain important considerations.
A New Chapter for a Historic Jewel
After more than 70 years in private hands, the Bulgari Pink is preparing to enter the international spotlight. Its forthcoming sale will offer collectors a rare opportunity to acquire a diamond that combines substantial size, intense natural colour, historic craftsmanship and an unusually long private ownership history.
Whether measured by its gemological characteristics or its place in jewellery history, the Bulgari Pink demonstrates why the world’s most exceptional diamonds continue to capture attention across generations.
Auction details
- Diamond: The Bulgari Pink
- Weight: 24.00 carats
- Colour: Fancy Intense Pink
- Classification: Type IIa
- Cut: Rectangular step cut (emerald cut)
- Auction: Christie’s Magnificent Jewels, Geneva
- Date: 10 November 2026
- Estimated value: CHF 10–15 million (approximately US$12–18 million)
- Public viewing: 5–10 November 2026
Source: Information supplied regarding Christie’s forthcoming Geneva auction. Auction details and gemstone classifications should be confirmed against the final Christie’s catalogue.
For more diamond news, education and expert insight, visit the DCLA Diamond Certification Laboratory of Australia.
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