Sotheby's is auctioning a rare six-carat [1] fancy vivid blue diamond in Geneva, Switzerland, during the week of May 13, 2024 [1, 2].
The sale highlights the extreme scarcity of blue diamonds that possess both high color intensity and a lack of internal flaws. Such a combination typically drives significant premiums among global collectors and investors.
The diamond is graded as fancy vivid blue [1] and is described as internally flawless [1]. A Sotheby's spokesperson said the stone's combination of intense color, zero internal flaws, and no fluorescence makes it exceptionally scarce [1]. The lack of fluorescence is a key technical attribute that contributes to the stone's clarity and value [1].
Sotheby's estimates the hammer price for the gem could reach up to US$12 million [1]. The high valuation is attributed to the stone's rarity and its origin. The diamond was mined at the Cullinan mine in South Africa [1, 2], a site world-renowned for producing some of the most significant diamonds in history.
The auction house announced the sale on May 7, 2024 [1]. The event will take place at the Sotheby's Geneva offices, a hub for high-value jewelry and art transactions. Experts said the combination of the six-carat weight [1] and the specific color grade makes this one of the few specimens of its kind available on the open market.
Because the stone is internally flawless and lacks fluorescence, it meets the most stringent criteria for gemological perfection. This rarity ensures that the diamond remains a target for high-net-worth individuals seeking assets that hedge against market volatility.
“The stone's combination of intense color, zero internal flaws, and no fluorescence makes it exceptionally scarce.”
The potential US$12 million price tag reflects a broader trend in the luxury asset market where 'investment-grade' gemstones—those with perfect clarity and rare colors—are treated more like financial instruments than jewelry. By sourcing the stone from the prestigious Cullinan mine and verifying its flawless status, Sotheby's is positioning the diamond as a low-risk, high-reward asset for collectors.
