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Bonhams To Auction Colour-Changing Diamond Necklace In Hong Kong

Depending on temperature and light conditions, the 'chameleon'
diamonds range from olive green (left) to shades of yellow (right).

Auction house Bonhams said that a necklace featuring nine ‘chameleon’ weighing a total of 13.87 carats will headline its jewellery auction in Hong Kong on November 25. The necklace is expected to fetch between $204,000 and $382,000 (HK$1,600,000 and HK$3,000,000). 

“Chameleon diamonds are amongst the rarest and most mysterious of coloured diamonds explains Bonhams Asia Director of Jewellery, Graeme Thompson, adding, “due to their rarity, little gemological information exists on them and scientists have yet to confirm the mechanism that causes their colour-changing behaviour. We are excited to present this extremely rare phenomenon in our upcoming sale.”

Alongside this piece, the Hong Kong sale will feature 149 other lots that range from coloured diamonds, coloured gemstones to signed jewellery. The coloured diamonds include an intense blue, three green diamonds, a seven-carat faint pink, and a collection of vivid yellows.

Highlight pieces include:

  • A 1.45-carat natural fancy intense blue diamond ring estimated at $255,000 to $382,000 (HK$2,000,000 to HK$3,000,000).
  • A 5.64-carat natural fancy vivid yellow, internally flawless emerald cut diamond ring by Cartier estimated at $382,000 to $510,000 (HK$3,000,000 to HK$4,000,000).
  • A 3.15-carat natural fancy intense yellowish green diamond ring estimated at $165,700 to $230,000 (HK$1,300,000 to HK$1,800,000).
  • A 1.51-carat natural fancy intense pinkish purple diamond ring estimated at $255,000 to $382,000 (HK$2,000,000 to HK$3,000,000).
  • A 1.24-carat natural fancy intense green diamond ring estimated at $102,000 to $153,000 (HK$800,000 to HK$1,200,000).

The sale also features a selection of coloured gemstones including Kashmir sapphires, Colombian emeralds, Burmese rubies, sapphires, spinels, Brazilian Paraiba tourmalines and Sri Lankan Padparadschas. 

The signed jewellery on offer at the sales includes pieces by Bulgari, Cartier, Chaumet, Graff, Harry Winston and Van Cleef & Arpels as well as from contemporary designers such as Alexander Laut.

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