Geneva Auction to Feature Rare 8.63 Carat Pink Diamond

 

An exceptional 8.63 carat natural pink diamond is set to take centre stage at Sotheby’s High Jewelry auction in Geneva on 11 November 2026, with an estimated price of up to US$6 million. The stone highlights the extraordinary rarity of natural pink diamonds and the continuing fascination they hold for collectors of important gemstones.

The unmounted oval modified brilliant cut diamond has been graded Fancy Intense Pink, VS2 clarity and Type IIa. Sotheby’s will present it as the leading lot in its High Jewelry sale, which will take place immediately before the auction house’s Royal & Noble Jewels sale in Geneva.

The diamond carries an estimated value of CHF 3.3 million to CHF 5 million, equivalent to approximately US$4 million to US$6 million. Its combination of substantial carat weight, intense natural colour and desirable gemological characteristics places it among the notable coloured diamonds appearing at international auction this season.

Where are natural pink diamonds found?

Natural pink diamonds have been recovered from several regions around the world, including Australia, South Africa, Lesotho, Tanzania, Russia, Brazil, Canada and historically India. However, these sources have not contributed equally to the market, and the geological conditions required to produce diamonds with a strong natural pink colour are exceptionally uncommon.

For decades, the most important commercial source was the Argyle diamond mine in Western Australia. Argyle became internationally renowned for its pink and red diamonds, despite these stones representing only a tiny fraction of the mine’s overall diamond production. The mine ceased operations in 2020, bringing an end to the regular supply from the world’s most significant historical source of pink diamonds.

Since the closure, the market has become even more conscious of the finite supply of Argyle-origin stones. However, pink diamonds continue to be found elsewhere, and discoveries in places such as Lesotho demonstrate that the geological potential for exceptional pink diamonds extends beyond Australia.

South Africa has its own distinguished place in this history, having produced some of the most famous large pink diamonds ever discovered.

The Steinmetz Pink: a South African diamond of extraordinary scale

One of the most remarkable examples of South Africa’s contribution to the world of natural pink diamonds is the legendary 59.60 carat Steinmetz Pink, now known as the CTF Pink Star.

The diamond began as a 132.50 carat rough crystal mined by De Beers in Africa in 1999. It was subsequently cut and polished by Steinmetz Diamonds over nearly two years, emerging as an oval diamond graded Fancy Vivid Pink and Internally Flawless by the Gemological Institute of America (GIA). It was unveiled publicly in Monaco in 2003 as the Steinmetz Pink.

The diamond later became known as the Pink Star and, following its acquisition by Hong Kong jewellery group Chow Tai Fook, the CTF Pink Star. In April 2017, it sold at Sotheby’s Hong Kong auction for HK$553 million, approximately US$71.2 million, setting a world auction record for a diamond or gemstone.

Its history illustrates why South Africa remains an important part of the story of exceptional pink diamonds. The country’s historic diamond fields have produced important coloured stones, including diamonds of remarkable size and quality.
Why are some pink diamonds so large?

The size of an exceptional pink diamond is not simply a consequence of its colour. Pink diamonds can occur in different geological environments, and their colour is associated with structural deformation within the diamond’s crystal lattice. This deformation affects how the stone interacts with light, producing its characteristic pink appearance. The precise mechanisms responsible for colour can vary between stones.

South Africa’s historic diamond deposits have produced large, important diamonds, while the Argyle mine in Australia became the dominant commercial source of pink diamonds because of the frequency with which pink stones appeared in its production. These are distinct geological and mining histories, rather than evidence that one country exclusively produces the largest pink diamonds.

The Steinmetz Pink demonstrates what can happen when a substantial rough diamond combines with exceptional colour and clarity. Its finished weight of 59.60 carats is particularly extraordinary because cutting a rough diamond involves balancing the retention of carat weight against the need to maximise colour, clarity, symmetry and overall appearance.

Unlike colourless diamonds, where the absence of colour is a major grading consideration, fancy coloured diamonds are assessed principally for their colour characteristics. These include hue, tone and saturation, alongside the stone’s clarity, carat weight, cut and overall appearance.

The distinction between Fancy Intense Pink and Fancy Vivid Pink is important. Fancy Vivid Pink represents a higher colour-intensity category, but it does not automatically follow that every vivid pink diamond is more valuable than every intense pink diamond. Size, clarity, colour distribution, cutting quality and market demand all influence the final price.

The November Geneva offering is graded Fancy Intense Pink with VS2 clarity. Its 8.63 carat weight and reported Type IIa classification add further gemological interest. Type IIa diamonds contain extremely low levels of nitrogen and can possess exceptional optical properties, although this classification alone does not establish a diamond’s value or geographic origin.

For DCLA, the auction is a reminder of the importance of independent gemological assessment when dealing with exceptional natural coloured diamonds. Reliable identification, colour grading, clarity assessment and documentation are essential to understanding what makes each stone distinctive.

A rare natural treasure in a changing market

The closure of the Argyle mine has brought greater attention to the scarcity of natural pink diamonds, particularly stones with strong colour and significant carat weight. While new discoveries remain possible in other diamond-producing regions, exceptional natural pink diamonds continue to be rare.

The upcoming Sotheby’s Geneva sale will provide another opportunity to see how collectors respond to a remarkable natural coloured diamond. Whether the 8.63 carat stone reaches its upper estimate remains to be seen, but its appearance at auction reinforces the enduring appeal of gemstones whose beauty is the result of extraordinary geological processes.

From South Africa’s famous Steinmetz Pink to the celebrated pink diamonds of Australia’s Argyle mine, these stones represent some of the most remarkable achievements of nature and the skill of the diamond cutter.

For further reading, explore DCLA’s coverage of Boodles and its major Argyle diamond acquisition and the laboratory’s historical report on the 59.60 carat pink diamond’s record-breaking auction.

DCLA is the Diamond Certification Laboratory of Australia. Independent gemological examination and accurate reporting help establish a diamond’s characteristics and support informed understanding of these rare natural treasures.

A Rare 24 Carat Diamond Set to Make Auction History

 

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.

The Extraordinary Rarity of Pink Diamonds: Christie’s Sets a $12 Million Estimate

 

Few gemstones command the combination of fascination, rarity and value associated with a natural pink diamond.

Unlike many coloured gemstones, the extraordinary pink colour of a natural diamond is not simply the result of a trace element creating a familiar colour. The science behind natural pink diamonds is considerably more complex. Their colour is generally associated with structural distortion within the diamond’s crystal lattice, created deep within the Earth over immense periods of geological time.

It is this extraordinary combination of natural rarity, geological history and optical beauty that has placed the finest pink diamonds among the world’s most coveted gemstones.

Now, Christie’s is preparing to offer another remarkable example.

At its Hong Kong Magnificent Jewels Autumn Auction on November 24, Christie’s will present an 8.41-carat pear modified brilliant-cut Fancy Vivid Purple-Pink diamond, with an estimate reaching HKD 95 million, approximately US$12 million.

The stone is also classified as Type IIa, adding another notable dimension to its gemmological profile.

When colour becomes the rarity

In the world of diamonds, carat weight is only one part of the story.

For exceptional coloured diamonds, hue, tone, saturation and distribution of colour can be every bit as important as size. A diamond may be large, yet its colour characteristics can determine whether it becomes merely unusual or genuinely extraordinary.

The Christie’s diamond combines several characteristics rarely encountered together: significant size, a strong purple-pink colour, Fancy Vivid intensity and Type IIa classification.

The result is a gemstone occupying an exceptionally rare position within the natural diamond market.

The distinction between a pink diamond and an exceptional pink diamond can be subtle to the untrained eye. Under professional examination, however, the precise characteristics of colour become a sophisticated subject of gemmological analysis.

The science behind natural pink

The colour of most natural diamonds is associated with impurities within the crystal structure. Nitrogen, for example, plays a major role in many yellow diamonds.

Pink diamonds are different.

Their colour is generally linked to deformation of the diamond’s atomic lattice, rather than simply the presence of a colouring impurity. Scientists believe that immense geological forces can distort the crystal structure during the diamond’s formation and subsequent journey toward the Earth’s surface.

This distortion affects the way light interacts with the diamond, producing the extraordinary pink appearance for which these stones are renowned.

The exact relationship between crystal deformation and the resulting colour remains an area of sophisticated scientific study, making pink diamonds particularly fascinating from both a gemmological and geological perspective.

Type IIa: exceptional chemical purity

The Christie’s diamond is classified as Type IIa, a designation that describes the diamond’s chemical composition.

Type IIa diamonds contain extremely low levels of detectable nitrogen and are regarded as among the chemically purest diamonds.

This classification should not, however, be confused with a quality grade.

Type IIa is a scientific classification, not a statement that a diamond is automatically more valuable. A diamond’s desirability and market value depend on the complete combination of its characteristics.

In this case, Type IIa adds another intriguing scientific feature to an already exceptional natural coloured diamond.

Why the strongest pinks are so difficult to find

The rarity of exceptional natural pink diamonds has been reinforced by the limited availability of significant sources of these stones.

For decades, Australia’s Argyle mine in Western Australia was internationally recognised as the world’s most important source of natural pink diamonds. The mine produced an extraordinary range of pink, red and purplish diamonds, but ceased production in 2020.

Its closure fundamentally changed the landscape for the supply of important natural pink diamonds.

While pink diamonds can occur in other deposits around the world, stones possessing the combination of strong colour, exceptional saturation, significant size and desirable clarity remain exceptionally uncommon.

This scarcity has helped establish the finest natural pink diamonds as important collector gemstones rather than simply luxury jewellery.

The auction market for exceptional colour

Major jewellery auctions provide a fascinating window into the upper end of the natural coloured diamond market.

When a rare stone comes to auction, collectors are not simply buying carat weight. They are competing for a combination of characteristics that may never be replicated.

The provenance of a jewel, its laboratory documentation, its natural colour, treatment status, cutting quality and historical significance can all contribute to its desirability.

For a gemstone of this calibre, laboratory examination is therefore fundamental.

A second extraordinary jewel

Christie’s Hong Kong sale will feature another remarkable gemstone in the form of a 10.10-carat Burmese ruby, set within a Cartier brooch incorporating triangular and square diamonds.

The jewel carries a high estimate of approximately HKD 60 million, or US$7.7 million.

The ruby is particularly significant for its Burmese origin and substantial size, while the Cartier design connects the jewel with the maison’s pioneering use of platinum during the early 20th century.

Exceptional Burmese rubies are among the world’s most celebrated coloured gemstones, particularly when they display desirable colour, transparency and other characteristics associated with fine-quality material.

The importance of knowing what lies beneath the beauty

At the highest levels of the jewellery market, beauty and science increasingly go hand in hand.

A spectacular diamond may capture the eye, but professional gemmology seeks to establish what the stone actually is, how its characteristics were formed and whether those characteristics are natural or treatment-related.

For coloured diamonds, this distinction can be particularly important.

Independent laboratory examination can investigate characteristics such as natural versus laboratory-grown origin, colour treatment, diamond type and other identifying features. For important stones, such documentation provides an objective scientific foundation for the jewel’s description.

At DCLA, the Diamond Certification Laboratory of Australia, gemmological examination is centred on independent scientific assessment and reporting in accordance with recognised international standards.

A jewel measured in rarity, not simply carats

The Christie’s 8.41-carat Fancy Vivid Purple-Pink diamond illustrates why exceptional gemstones occupy a category of their own.

Its significance lies not simply in its weight.

It is the combination of natural colour, vivid intensity, purple-pink hue, substantial size, Type IIa classification and exceptional geological rarity that makes the stone so compelling.

As it takes its place under the hammer in Hong Kong, collectors will once again be reminded of one of the enduring truths of the diamond world:

The rarest diamonds are not necessarily the largest. They are the diamonds in which nature has created something extraordinarily difficult to reproduce.

And in the case of a truly exceptional natural pink diamond, that rarity began billions of years before it ever became a jewel.

Fancy Colour Diamonds, From Hollywood Statement to the Ultimate Collectable

 

For generations, the traditional diamond engagement ring has been dominated by the classic colourless stone. But the world of exceptional diamonds is changing. Increasingly, collectors, celebrities and high jewellery connoisseurs are turning towards something far rarer and far more individual: natural fancy colour diamonds.

From vivid pinks and intense blues to extraordinary greens, yellows and the exceptionally rare reds, these diamonds are no longer simply an alternative to the traditional white diamond. They are becoming recognised as some of the most desirable and collectible gems in the world.

Jennifer Lopez Put Green Diamonds in the Spotlight

One of the most talked-about examples came in 2022, when Ben Affleck proposed to Jennifer Lopez with an extraordinary natural green diamond.

The choice was particularly appropriate for Lopez, who has long associated the colour green with good fortune and famously wore the iconic green Versace dress at the 2000 Grammy Awards.

But the ring represented more than a celebrity engagement.

It introduced millions of people to a diamond category that had traditionally been the domain of specialist collectors and serious diamond enthusiasts.

Green diamonds are exceptionally unusual. Unlike many other coloured diamonds, their colour is generally associated with natural radiation occurring over geological time. Importantly, green colour can be concentrated near the surface of the diamond, making the cutting and preservation of the stone particularly challenging.

The result is a diamond where colour, rarity, provenance and individuality can all become major components of its value.

According to GIA, natural fancy colour diamonds are among the rarest gemstones, with red, green, purple and orange among the rarest colours.

What Makes a Fancy Colour Diamond So Special?

With a conventional D-to-Z diamond, the absence of colour is generally desirable.

Fancy colour diamonds work differently.

Their value can increase with the strength, purity and quality of the colour. GIA’s grading system assesses factors including hue, tone and saturation, with descriptions such as Fancy, Fancy Intense, Fancy Vivid and Fancy Deep.

This creates a fascinating situation in the diamond market.

Two diamonds of exactly the same weight can have dramatically different values because their colours are different.

A small variation in hue or saturation can transform a beautiful diamond into an exceptional one.

And when the colour is extremely rare, the difference can be enormous.

The most coveted colours include:

Red – among the rarest of all natural diamond colours.

Pink – historically one of the most sought-after colours among collectors.

Blue – exceptionally rare, with its colour generally associated with boron.

Green – extraordinarily unusual and often associated with natural radiation.

Orange – rare and highly prized when the colour is strong and pure.

Yellow – more commonly encountered than green, blue or red, but spectacular vivid yellow diamonds can be exceptionally valuable.

GIA notes that saturated pinks, blues and greens are among the rarest and most valuable fancy colour diamonds.

Celebrities Are Changing the Conversation

Fancy colour diamonds have a long relationship with Hollywood and international celebrity culture.

The legendary Tiffany Yellow Diamond, weighing 128.54 carats, is one of the world’s most famous yellow diamonds. It has been associated with Audrey Hepburn, Lady Gaga and Beyoncé, helping demonstrate how a coloured diamond can become part of popular culture rather than simply a gemological curiosity.

Other celebrities including Beyoncé, Paris Hilton, Miley Cyrus, Angelina Jolie and Heidi Klum have also worn fancy colour diamonds on major occasions.

And the trend is very much alive today.

At the 2026 Oscars, Kate Hudson made headlines wearing more than 41 carats of rare green diamonds by Milan-based Garatti. Her spectacular jewellery included a 16-carat fancy green diamond necklace, a 15-carat Fancy Deep green diamond ring and matching green diamond earrings. The collection was reported at approximately US$35 million.

Lupita Nyong’o also brought green diamonds to the red carpet in 2026, wearing Garatti earrings incorporating Fancy Intense Green diamonds at The Odyssey world premiere in London.

At the 2026 Golden Globes, Kate Hudson again wore green diamonds, including a 5-carat pear-shaped Fancy green diamond and a 3.19-carat Fancy Deep green diamond combined with pink and white diamonds.

These appearances are important because they expose a much wider audience to a category of diamond that was once largely understood only by specialists.

The Rise of the Collector’s Diamond

The greatest appeal of a natural fancy colour diamond is that it can be much more than jewellery.

It can become a collectable gemstone.

Unlike mass-market jewellery, exceptional natural colour diamonds are finite. There is no guarantee that another stone with exactly the same combination of colour, saturation, size, clarity, shape and provenance will ever appear.

That individuality is fundamental to their attraction.

A collector may therefore look at a fancy colour diamond in much the same way an art collector looks at a unique painting.

The question isn’t simply:

“How much does it cost?”

It becomes:

“How rare is it, how exceptional is it, and will another one like it ever come onto the market?”

Green Diamonds Require Specialist Knowledge

Green diamonds are particularly fascinating because their colour formation and appearance can be complex.

GIA explains that the green colour in many natural green diamonds is concentrated near the surface of the stone, which means cutters often attempt to preserve natural rough material around the girdle.

This makes identification and grading particularly important.

A purchaser should never rely simply on the description “green diamond”.

The exact grading terminology matters.

Natural or laboratory-grown?

What is the origin of the colour?

What is the strength and distribution of the colour?

What laboratory has graded the stone?

What does the certificate actually say?

For a significant fancy colour diamond, independent laboratory documentation is essential.

Fancy Colour Diamonds Are Not Just a Fashion

Celebrity attention can create trends, but the fascination with fancy colour diamonds goes much deeper.

Their rarity is geological.

Their beauty is natural.

Their individuality is impossible to reproduce precisely.

And the finest examples can occupy a completely different level of the diamond market from ordinary jewellery diamonds.

This is why the current interest in green diamonds should not simply be dismissed as another celebrity fashion.

Jennifer Lopez may have helped introduce green diamonds to a global audience, but the stones themselves have been extraordinary for millions of years.

Today, collectors are beginning to appreciate what specialist diamond dealers and gemmologists have known for decades:

the world’s rarest diamonds are not necessarily the whitest.

Sometimes, the colour is the most valuable thing of all.

DCLA: Knowledge Matters

For anyone considering the purchase of a significant fancy colour diamond, independent expertise is critical.

At the Diamond Certification Laboratory of Australia (DCLA), the assessment of a diamond goes beyond simply looking at whether a stone appears attractive.

Fancy colour diamonds require specialist knowledge and careful assessment because subtle differences in colour can have a substantial effect on rarity, classification and value.

A beautiful coloured diamond is an exciting purchase.

An authenticated, professionally graded natural fancy colour diamond can be something much more significant: a rare gemstone with the potential to become a family heirloom and a serious collector’s asset.

DCLA — where diamond knowledge, science and independent assessment come together.

Sources

Fancy Color Diamond Quality Factors

The Magic of Colored Diamonds

Colored Diamonds Buyer’s Guide

Tiffany Yellow Diamond history

Natural Diamonds — Oscars 2026

Natural Diamonds — The Odyssey 2026

People — Kate Hudson’s 2026 Oscars green diamond jewellery