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Bonhams to Sell Rare Chameleon Diamonds

Color-changing stones to go under hammer in Hong Kong.
Oct 31, 2018 8:07 AM   By Rapaport News
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RAPAPORT... Bonhams’s jewelry sale in Hong Kong will spotlight a rare necklace featuring the largest collection of chameleon diamonds offered at auction, according to the company.

The piece — which will lead the Rare Jewels and Jadeite sale on November 25 — includes nine diamonds weighing a total of 13.87 carats. The necklace carries a presale estimate of HKD 1.6 million to HKD 3 million ($204,000 to $382,500).

“Chameleon diamonds are amongst the rarest and most mysterious of colored diamonds,” Graeme Thompson, director of jewelry at Bonhams Asia, said Monday. “Depending on temperature and light conditions, the diamond’s color transforms from ‘olive’ green to a mesmerizing brownish-yellow or yellow.”

Due to their rarity, there is little gemological information available on these diamonds, and scientists have not identified what causes their color change, Thompson added.

Other notable pieces going under the hammer include an intense- to bright-emerald-green jadeite bangle estimated at HKD 7.5 million to HKD 10 million ($956,200 to $1.3 million). A 4.02-carat pigeon’s-blood ruby and diamond ring valued at HKD 4.8 million to HKD 6.8 million ($612,000 to $866,900) will also feature at the November sale.

Signed jewelry from Cartier, Chaumet, Graff, Harry Winston and Van Cleef & Arpels will also be up for sale, as well as a signed Bulgari necklace-and-earring set estimated at HKD 4.7 million to HKD 6 million ($599,200 to $764,900).

The sale will feature a selection of colored diamonds, including an intense blue, three greens, a faint pink, a fancy-intense pinkish-purple, and a few vivid-yellow diamonds.

Bonhams will preview the items in Taipei, Singapore, Sydney and Hong Kong.

Image: Chameleon diamond necklace in green (left) and yellow (right). (Bonhams)
Tags: bonhams, Bulgari, Cartier, Chameleon Diamonds, Chaumet, Graeme Thompson, Graff, Harry Winston, Hong Kong, Rapaport News, Rare Jewels and Jadeite, Van Cleef & Arpels
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