The Williamson
Pink Star
11.15 carat Fancy Vivid Pink Internally Flawless Cushion Cut Diamond
Reference No. 7433
The world’s most valuable diamond in the world per carat.
“
The Williamson Pink Star is one of the most extraordinary pink gems ever discovered.
— David Rosenberg
I
The World’s Most Valuable Diamond Per Carat
An extraordinary 11.15 carat cushion-cut diamond of historic importance, The Williamson Pink Star is among the rarest and most significant pink diamonds ever discovered. Graded Fancy Vivid Pink and Internally Flawless by the Gemological Institute of America (GIA), the diamond possesses a saturation, purity, and transparency achieved by only a minute handful of pink diamonds known to the world.
Unearthed in 2021 from the legendary Williamson Mine in Tanzania, a source revered for producing the world’s most coveted “bubble gum” pink diamonds, the original rough crystal weighed an impressive 32.32 carats. From this exceptional rough emerged a gemstone of singular beauty and remarkable character, ultimately fashioned into the breathtaking cushion-cut masterpiece now known as The Williamson Pink Star.
Classified as Type IIa, the diamond belongs to the rarest chemical category of diamonds, virtually devoid of nitrogen impurities and celebrated for exceptional optical transparency. This extraordinary purity allows light to pass with remarkable vitality through the stone, intensifying its vivid pink saturation and unleashing a mesmerizing display of brilliance and fire.
A diamond of this caliber transcends rarity, it enters the realm of legend.
Described by David Rosenberg as “one of the most extraordinary pink gems ever discovered,” The Williamson Pink Star quickly captured international attention upon its unveiling at auction.
11.15 carat Fancy Vivid Pink Internally Flawless Cushion Cut Diamond · Reference No. 7433
32.32 carats · Williamson Mine, Tanzania
II
The Rough
“The Williamson Pink Star is one of the most extraordinary gems of the 20th century.”
This 11.15 carat cushion cut diamond is a rare masterpiece, graded Fancy Vivid Pink and Internally Flawless (IF) — a combination so rare that even among pink diamonds, it stands in a league of its own.
III
The Auction
Bidding frenzy takes ‘The Williamson Pink Star’ to HK$453.2 million / US$57.7 million.
In October 2022, The Williamson Pink Star achieved worldwide acclaim during a landmark sale at Sotheby’s Hong Kong, where it realized HK$453.2 million / US$57.7 million following an electrifying twenty-minute bidding battle among collectors and connoisseurs from around the globe.
The extraordinary result established a world auction record price per carat for any diamond or gemstone ever sold at auction and positioned the jewel among the most valuable gemstones in history.
Acquired by David Rosenberg of Rosenberg Diamonds & Co., the stone immediately became one of the most celebrated diamonds of the modern era, a masterpiece destined for the highest echelon of important gem collections.
Sotheby’s Hong Kong · October 2022
IV
The Redesign
Nothing says I love you more than a combination of a Flawless Fancy Vivid Pink set in a graduating band of D Flawless Hearts, with a delicate row of Fancy Vivid Pink Argyle diamonds and a collage of mixed size micro pavé dressing up the profile shank of the ring.
Reimagined as an enduring expression of romance and haute joaillerie, The Williamson Pink Star is now masterfully set within an extraordinary bespoke ring of exceptional refinement.
The legendary Fancy Vivid Pink diamond is embraced by a graduating band of heart-shaped diamonds of D color and Flawless clarity, meticulously selected for their perfect harmony and brilliance. Delicate accents of rare Fancy Vivid Pink Argyle diamonds trace the composition with subtle intensity, while an intricate collage of mixed-size micro pavé diamonds adorns the profile and shank with luminous sophistication.
Architectural yet impossibly graceful, the design transforms one of the world’s most celebrated diamonds into a singular work of wearable art, a jewel conceived not merely to be admired, but remembered for generations.
*Please note: Due to the exceptional rarity and significance of the featured diamond, the stated center stone weight(s) may be exact or approximate, preserving the discretion and exclusivity of these extraordinary gems.
Private Inquiry
The Williamson Pink Star
Each iconic stone is offered through private appointment. Speak with an advisor to receive complete documentation, provenance, and viewing arrangements.
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