The 10.38-carat Fancy Purple-Pink diamond, believed to have royal provenance tracing back to Queen Marie-Antoinette of France and her daughter Duchess Marie-Thérèse of Angoulême, is one of the standout lots. Estimated at $3 to $5 million by Christie’s, the diamond features a rare modified kite brilliant cut and vibrant hue, attributes that are further elevated by its mid-18th-century origins—possibly from India, where purple-pink diamonds are exceptionally rare.

GIA confirmed the diamond’s natural colour and characteristics through its Colored Diamond Grading Report, adding scientific weight to its historical narrative. “Through our evaluations, GIA helps document the properties and legacy of these significant gems,” said Tom Moses, GIA’s Executive Vice President and Chief Laboratory and Research Officer.

Other highlights from the GIA-evaluated collection include a 60-carat unmounted diamond praised for its symmetry and clarity, and a diamond pendant necklace with refined European design influences.

As interest in coloured diamonds grows, particularly following the closure of the Argyle mine in Australia, stones like the Marie-Thérèse Pink serve as enduring symbols of both geological rarity and aristocratic legacy.