The Bulgari Blue Diamond: A Gem of History, Beauty, and Prestige

The Bulgari Blue Diamond: A Gem of History, Beauty, and Prestige

Bulgari Blue Diamond Ring

Bulgari Blue Diamond Ring // Christie's


The Bulgari Blue Diamond is not just another gemstone—it is a mesmerizing gem that embodies the pinnacle of luxury, craftsmanship, and rarity. Created by Bulgari, the Italian brand synonymous with opulence and fine jewelry, this extraordinary diamond ring features a stunning 10.95-carat blue diamond and a 9.87-carat white diamond. Set in a classic toi et moi design, this piece is not just a testament to Bulgari's expertise in high jewelry but also a rare geological marvel. The blue diamond captivates with its ethereal hue and flawless clarity, making it one of the most sought-after gemstones in the world. A true masterpiece, the Bulgari Blue Diamond captures the imagination, offering a glimpse into the extraordinary capabilities of nature and human craftsmanship.


Significant Owners

European Collector

The identity of the European collector who first purchased the Bulgari Blue Diamond from Bulgari remains somewhat of a mystery. However, their choice in investing in such an extraordinary gemstone not only placed the diamond on the map but also set the stage for its future historical importance.

The Auction Circuit

After being held privately by its initial owner for decades, the Bulgari Blue Diamond resurfaced in the auction circuit. In 2010, it was auctioned at Christie's New York and garnered a tremendous amount of attention from collectors and investors around the globe. The bidding war ended at a record-breaking price of $15.7 million, making it one of the most expensive blue diamonds ever sold at that time.

Anonymous Owners

Since the Christie's auction, the diamond has been held by a series of anonymous private owners, adding to its mystique and allure. While the current owner's identity is confidential, the Bulgari Blue Diamond continues to make appearances in select exhibitions, securely guarded and insured for an amount that befits its legacy.


History and Story Behind the Diamond

Pre-1970s: The Genesis

While the exact origin of the Bulgari Blue Diamond remains undisclosed, it is believed to have been sourced from the Golconda mines in India or the Cullinan mines in South Africa—both renowned for their rare blue diamonds. The diamond was then meticulously cut and polished by master craftsmen, before being set in the Bulgari ring.


1970s: Bulgari’s Intervention

Bulgari, a name that reverberates with opulence and elegance, is the mastermind behind the Bulgari Blue Diamond ring. The Italian luxury brand, founded in 1884, has a longstanding tradition of creating exceptional pieces of high jewelry that fuse art, fashion, and rare gemstones. When the brand acquired the 10.95-carat blue diamond in the 1970's, they already knew it deserved to be paired with something equally exceptional. Their designers and artisans worked meticulously to conceptualize and ultimately craft the now-iconic toi et moi design that showcases the blue diamond alongside a 9.87-carat white diamond. The triangular, or trilliant, cut chosen for both stones serves to amplify their brilliance and add a modern touch to a traditional design.

While not much anecdotal information is available about Bulgari's creation process for the ring, the craftsmanship and attention to detail involved would have been second to none, in line with the brand's ethos. Typically, Bulgari's master craftsmen spend countless hours, often requiring weeks or months, to bring such complex designs to fruition. Given the rarity of the gemstones, the Bulgari Blue Diamond ring would have been treated as an extraordinary project within the atelier, executed by the hands of Bulgari's most experienced artisans.

Bulgari is known for treating its exclusive pieces as works of art, often displaying them in special events or exhibitions before they find a home with a private collector. Although exact details of where the Bulgari Blue Diamond ring was displayed before its sale to the European collector in the 1970s are scarce, it would not be surprising if the piece graced the showcases of elite Bulgari events or private showings. Such exclusive displays, carefully curated, allow a select audience to appreciate the artistry and craftsmanship of unique pieces, long before they reach auction houses or private collections. The Bulgari Blue Diamond, with its compelling narrative and dazzling aesthetic, perfectly encapsulates the marriage of natural wonder and human ingenuity that Bulgari so excels at.


2010: Christie's Auction

The auction of the Bulgari Blue Diamond at Christie’s in New York in 2010 was nothing short of a spectacle that captured the attention of gem enthusiasts, collectors, and investors worldwide. The gemstone had been largely out of the public eye since its purchase by a European collector in the 1970s, and its re-emergence was highly anticipated. By the time it hit the auction block, the buzz around this exquisite piece had reached a fever pitch.

Christie's is known for curating some of the most high-profile auctions in the world, and the inclusion of the Bulgari Blue Diamond in their 2010 catalog significantly elevated the event's profile. The room was filled with palpable tension as bidding commenced. Each bid escalated quickly, testifying to the diamond’s allure and the keen interest of those present, which likely included anonymous phone bidders representing the global elite. The competitive bidding was not just about acquiring a rare gemstone; it was about obtaining a piece of art and history masterfully crafted by Bulgari.

The final hammer fell at a staggering $15.7 million, making the Bulgari Blue Diamond one of the most expensive blue diamonds ever sold at auction at that time. The price reflected not only the gemological qualities of the diamond but also its provenance and its creation by a brand as prestigious as Bulgari. This record-breaking sale was a testament to the stone’s intrinsic value, which goes beyond carat weight and clarity to include its historical importance and its status as a cultural artifact. The auction established the Bulgari Blue Diamond as a legend in the world of fine jewelry and rare gemstones, a legend that continues to captivate imaginations to this day.


Gemological Detail

Bulgari Blue Diamond

Bulgari Blue Diamond Loose // Christie's

Type IIb Classification

In the complex world of gemology, diamonds are classified into different types based on their chemical composition and the presence or absence of detectable nitrogen. The Bulgari Blue Diamond falls under the Type IIb classification, which is a particularly rare and fascinating category, making up less than 0.1% of all natural diamonds. What sets Type IIb diamonds apart is the presence of boron impurities in their structure, which is responsible for giving them their signature blue or gray coloration.

Unlike Type I diamonds, which contain nitrogen, Type II diamonds are essentially devoid of nitrogen. However, the minuscule amounts of boron in Type IIb diamonds serve a significant role. Boron atoms replace some carbon atoms in the diamond's crystal lattice. When light interacts with this altered structure, the boron atoms absorb certain wavelengths of light, particularly in the yellow range of the spectrum. As a result, the diamond reflects a captivating blue hue. This boron-related absorption of light not only gifts these diamonds their distinct color but also makes them semi-conductive, unlike other types of diamonds that are insulators.

Another noteworthy feature of Type IIb diamonds is that they often display high levels of clarity. The absence of nitrogen in their structure means that there are fewer elements to disrupt the crystal lattice, resulting in fewer inclusions and blemishes. This often translates to diamonds of exceptional clarity, one of the coveted "4 Cs" in diamond grading.

To summarize, a diamond gains a Type IIb classification through a combination of unique geological conditions. It must form in an environment where boron is present but nitrogen is almost completely absent, a rare occurrence in the Earth's mantle. The boron atoms integrate themselves into the diamond's crystal structure, leading to the absorption of specific light wavelengths and the consequent blue coloration. Combine this with often exceptional clarity, and you have the makings of a gemological wonder like the Bulgari Blue Diamond.


4 Cs

The Bulgari Blue Diamond ring is a marvel in gemological terms, featuring two triangular-shaped diamonds that adhere to the highest standards of the "4 Cs"—Carat, Cut, Color, and Clarity. The blue diamond weighs an impressive 10.95 carats, making it a gemstone of significant size. Its accompanying white diamond isn't far behind, boasting a weight of 9.87 carats. The substantial carat weights of both diamonds contribute greatly to their intrinsic and monetary value, setting the stage for the ring to be a much sought-after piece.

When it comes to cut, both diamonds are fashioned into triangular or "trilliant" shapes, which enhances their brilliance and maximizes their reflective properties. This cut is especially noteworthy for bringing out the blue diamond's intrinsic hue and showcasing the white diamond's lack of color, which in diamond terms is a desirable trait. The cut also provides a contemporary flair to the traditional toi et moi design, presenting an appealing visual balance between the two stones.

Color is undoubtedly the blue diamond's most mesmerizing feature. Classified as a Type IIb diamond, its blue hue is owed to traces of boron within its structure. The rich, intense color is evenly distributed throughout the gem, a rare characteristic that places it among the most exquisite blue diamonds in existence. The white diamond complements it perfectly, presenting a stunning contrast that heightens the beauty of both gems.

In terms of clarity, both diamonds excel. While the exact grades are often kept confidential, the Bulgari Blue Diamond is said to have exceptional clarity with no significant inclusions or blemishes visible to the naked eye. The white diamond, too, is of very high clarity, which adds to the overall allure and value of the ring.

Together, these factors—Carat, Cut, Color, and Clarity—combine to make the Bulgari Blue Diamond ring a gemological masterpiece. Its adherence to the highest standards of the "4 Cs" places it in a rarefied category of diamonds that are not only beautiful to behold but also serve as benchmarks for quality in the world of fine gemstones.


Geological Details

The geological conditions required to produce a blue diamond are exceedingly rare. These diamonds form at depths of over 400 miles in the Earth’s mantle, requiring high pressure and specific conditions to incorporate boron into their crystal structure. The stone then makes its way closer to the surface through volcanic activity, enclosed in kimberlite or lamproite pipes, before being extracted.



Monetary Value

As of its last known valuation, the Bulgari Blue Diamond was worth around $15.7 million. However, the increasing scarcity of blue diamonds, coupled with the Bulgari Blue’s historical importance, has likely led to an increase in its intrinsic value over the years. Today, the Bulgari Blue Diamond Ring may sell for more than $25million


Intrinsic Value

Beyond its monetary worth, the Bulgari Blue Diamond holds immeasurable value in terms of its historical importance and the legacy it carries. Its ownership lineage, gemological perfection, and iconic design make it an unparalleled asset in the world of gemstones.



The Bulgari Blue Diamond transcends the boundary of being a mere gemstone; it is a historical artifact, a work of art, and a treasure that has captivated the imaginations of people across generations. Whether it's its enviable lineage of owners, its exceptional gemological and geological characteristics, or its immense value, the diamond continues to solidify its place as one of the world's most coveted and fascinating gems.


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