Independent media since 2014
by Charlotte Wannebroucq · CNE Accredited Gemmologist

THE MELLON BLUE

Next November, Geneva will host one of those rare moments when the high jewelry market intersects with cultural history. Christie’s will offer for sale The Mellon Blue, a 9.51-carat Fancy Vivid Blue diamond of said purity, Internally Flawless.
Charlotte Wannebroucq, CNE-certified expert gemmologist
Founder and Editor-in-Chief
Updated on 17 October
Updated on 17 October 2025
Bague diamant bleu taille poire
CHRISTIES MELLON BLUE

The Mellon Blue, a diamond to the historical roots at Christie’s.

The Mellon Blue© CHRISTIE'S
The Mellon Blue
© CHRISTIE’S

Next November, Geneva will host one of those rare moments when the high jewelry market intersects with cultural history. On November 11, at the Four Seasons Hôtel des Bergues, Christie’s will offer for sale The Mellon Blue one diamond Fancy Vivid Blue of 9.51 carats, of a purity said to be Internally Flawless. Set in a ring, this gem takes center stage in the prestigious sale Magnificent Jewels.

If the brilliance of the stone is enough to captivate, it is its journey that sets it apart. Once worn as a pendant by Rachel Lambert Mellon, nicknamed Bunny, it embodies an aesthetic vision carried by a woman whose taste was expressed both in interiors and in gardens. Mellon (1910-2014), horticulturist, philanthropist and friend of personalities such as Hubert de Givenchy or John F. Kennedy, gave her jewelry an intimate dimension. An extension of her way of life.

This diamond He was last seen in 2014, when he made a sensation in New York. His return eleven years later is part of a narrative of transmission, where nature, art and history come together. Valued between 20 and 30 million dollars, it is destined to attract the attention of an international audience.

And as a subtle echo, the gaze turns to the gardens she designed: the rose garden at the White House, recreated in 1961, or the The King's Vegetable Garden from Versailles, restored with great care. The diamond, In its own way, it extends this imprint: an timeless elegance, shaped by a singular sensibility.

Partner

Second-hand designer jewellery, authenticated piece by piece.

Discover
Related signatures
Topics
Share
LinkedIn
Pinterest
Facebook
Email
Charlotte Wannebroucq, CNE-certified expert gemmologist
The author

Charlotte Wannebroucq

Gemmologist expert, member of the CNE-Art, and expert in signed jewelry. Twenty-five years of experience at the heart of Parisian jewelry, between the Carré Rive Gauche and Place Vendôme.
She signs the decryptions of collections, the analyses of stones and the estimates published in Esprit Joaillerie. Each piece commented on is examined in person, in the workshop, in the sales room or in the showroom.
  • Expertise

    Gemmology and signed jewellery

  • Member

    CNE-Art

  • Experience

    Over 25 years in Parisian jewellery