Category: Media & Culture / May 7, 2013 6:56 PM EDT
A 75.36-carat diamond, the biggest briolette diamond ever to appear at auction, was the highlight of Christie's Hong Kong preview of their upcoming Magnificent Jewels sale on Tuesday (May 7).
Christie's expects to sell the broiled, suspended from a purplish pink diamond fastened to a diamond chain at US$8.5 million - US$12.5 million.
According to Christie's jewellery specialist, Chiang Shiu-Fung, the piece is exceptionally rare.
"I remember when I first joined Christie's in 2007, that was already six years ago. We had a similar item, also a briolette with D-flawless clarity, but that is only a 30-something carats, so this is a double. So you can see how rare it is," said Chiang.
Chiang said this briolette is Type IIa, the chemically purest type of diamond.
Other famous Type IIa diamonds include Kor-i-Noor, which was set into the Crown of Queen Elizabeth.
"Briolette is so special because we have to find a piece of rough that is big enough to cut through a briolette style. What is briolette? It's actually a three-dimensional, like a tear-shaped water drop with very good quality of rough. Because you can imagine, if the rough, the clarity is not good enough, you can easily find the inclusion or the black spot inside, it will decrease the value and the visual appeal," said Chiang.
The diamond arrived at American diamond dealership, William Goldberg, as a 160.5-carat rough and was shaped into a 75.51 carat briolette diamond, which was certified by the Gemological Institute of America (GIA) as the largest briolette-shaped, flawless diamond graded at the time according to William Goldberg's database.
The necklace will go under the hammer with over 290 jewels estimated to reach in excess of US$74 million on May 28.
(Video Source: REUTERS)