In recognition of World Diamond Day, we reflect on some of the most extraordinary diamonds ever offered at auction stones that not only achieved record-breaking prices but also represent the pinnacle of rarity, craftsmanship, and natural beauty.
Established by the Natural Diamond Council, World Diamond Day celebrates the enduring significance of natural diamonds, highlighting their provenance, emotional value, and the moments they commemorate. It is also an opportunity to examine the exceptional stones that continue to define the upper limits of the global diamond market.
Below is a selection of some of the most important diamonds ever sold at auction.
The CTF Pink Star

The CTF Pink Star remains the most expensive diamond ever sold at auction. This 59.60 carat oval-shaped, fancy vivid pink diamond achieved US$71.2 million at Sotheby’s Hong Kong in 2017.
Internally flawless and cut from a 132.5 carat rough discovered in 1999, the stone required over two years of meticulous planning and craftsmanship to realise its final form. It was acquired by Chow Tai Fook, setting a benchmark for coloured diamonds globally.
The Williamson Pink Star

Achieving US$57.7 million in 2022, this 11.15 carat cushion-cut fancy vivid pink diamond is among the finest ever graded.
Originating from a 32.32 carat rough from Tanzania’s Williamson mine, it was classified as internally flawless by the Gemological Institute of America, placing it among the rarest gemstones known.
The Oppenheimer Blue

This 14.62 carat emerald-cut vivid blue diamond sold for US$57.5 million at Christie’s Geneva in 2016.
Named after its former owner, Sir Philip Oppenheimer, the diamond drew intense global attention and was ultimately secured after a competitive international bidding process.
The Blue Moon of Josephine

Cut from a 29.62 carat rough discovered in South Africa in 2014, this 12.03 carat fancy vivid blue diamond achieved US$48.4 million at Sotheby’s Hong Kong in 2015.
Purchased by Hong Kong collector Joseph Lau, it was renamed in honour of his daughter, further cementing its place in modern diamond history.
The Graff Pink

This 24.78 carat fancy intense pink diamond sold for over US$46 million at Sotheby’s Geneva in 2010.
Acquired by Laurence Graff, the stone had not appeared on the market for more than 60 years prior to its sale, adding to its provenance and desirability.
The Princie Diamond

Selling for US$39.3 million at Christie’s New York in 2013, the Princie Diamond carries remarkable historical significance.
Originating from India’s famed Golconda mines and once owned by the Nizams of Hyderabad, the diamond reflects the rich heritage of some of the world’s most celebrated diamond sources.
The The Orange

Weighing 14.82 carats, this pear-shaped fancy vivid orange diamond remains the largest of its kind ever recorded.
It achieved US$35.5 million at Christie’s Geneva in 2013, significantly exceeding pre-sale expectations and reinforcing the rarity of orange diamonds.
The Magnificent Oval Diamond

One of the largest D-colour flawless diamonds ever to appear at auction, this 118.28 carat oval-cut stone sold for US$30.8 million at Sotheby’s Hong Kong in 2013.
Its exceptional colour and clarity grading underscore the importance of strict laboratory standards in determining value—an area where independent certification remains critical.
A Reflection on Rarity and Value
These diamonds are more than record-breaking assets—they are geological miracles shaped over billions of years and refined through exceptional human skill. Their value lies not only in carat weight or colour grading, but in rarity, provenance, and the precision of their cutting and certification.
As World Diamond Day highlights, natural diamonds continue to occupy a unique position in both the luxury and investment landscape. For laboratories such as the Diamond Certification Laboratory of Australia, the role of accurate and independent grading remains fundamental in preserving confidence and transparency within the global diamond market.
Source: DCLA










