Rare blue diamonds will be auctioned in Hong Kong for £4 million

Abstract According to the British "Daily Telegraph" reported on March 1, a weight of 5.16 carat rare blue diamond auction will be held next month in Hong Kong, China, valued around 400 million pounds (US $ 5.96 million). It is reported that this flawless pear-shaped gem is the world's most...

According to the British "Daily Telegraph" reported on March 1, a rare blue diamond weighing 5.16 carats will be auctioned in Hong Kong, China next month, with an estimated value of 4 million pounds (about 5.96 million US dollars).
It is reported that this flawless pear-shaped gemstone is one of the precious collections of the world's largest diamond producer, De Beers, South Africa. The company spent decades collecting 12 rare diamonds and presented the world with this precious collection in 2000, and the upcoming blue diamond became the first product to enter the market.
According to the report, this blue diamond is undoubtedly a "star sign" at the 2010 Shanghai Spring Jewelry Auction in Sotheby's (an art auction house in London, UK). The specific auction time is scheduled for April 17. At present, China's diamond market is the largest and fastest growing in the world. Industry insiders predict that with the rapid development of China's economy, it will become the next big buyer of rare gems.
“The ideal sky blue, flawless transparent interior structure and classic shape are destined to make this diamond shine at the auction, and the world’s discerning collectors will definitely compete for the bid,” the auction house said in a statement. .
In the process of forming diamonds, they contain various color systems due to the presence of trace elements. Among them, red, blue, green and pink are very rare and expensive, and most of them are collected by jewelers or collectors. The identification criteria for colored diamonds are usually divided into FANCYLIGHT, FANCY, FANCYINTENSE, FANCY VIVID, FANCYDARK and FANCYDEEP, the blue mentioned in the text. The color diamonds belong to the color level.

Slick Drill Collaris mainly used to provide bit weight to drill bit so that Drill Pipe is in tension. Especially Drill Collar can keep drill bit centralized and hole track by large rigidity. The Drill collar are manufactured strictly from API Spec7-1 and SY5411 standard.


Material: 4145H/4145Hmod  

Slick drill collar Parameter


Type
OD(mm) ID(mm)
L(m)
±152.4mm
d

DF(mm)    
±0.4

NC23-31
79.4 31.8 9.14 76.2
NC26-35 88.9 38.1 9.14 82.9
NC31-41 104.8 50.8 9.14or9.45 100.4
NC35-47 120.6 50.8 9.14or9.45 114.7
NC38-50 127 57.2 9.14or9.45 121
NC44-60 152.4 57.2 9.14or9.45 144.5
NC44-60 152.4 71.4 9.14or9.45 144.5
NC46-62 158.8 57.2 9.14or9.45 149.2
NC46-62 158.8 71.4 9.14or9.45 150
NC46-65 165.1 57.2 9.14or9.45 154.8
NC46-65 165.1 71.4 9.14or9.45 154.8
NC46-67 171.4 57.2 9.14or9.45 159.5
NC50-70 177.8 57.2 9.14or9.45 164.7
NC50-70 177.8 71.4 9.14or9.45 164.7
NC50-72 184.2 71.4 9.14or9.45 169.5
NC56-77 196.8 71.4 9.14or9.45 185.3
NC56-80 203.2 71.4 9.14or9.45 190.1
6-5/8REG 209.6 71.4 9.14or9.45 195.6
NC61-90 228.6 71.4 9.14or9.45 212.7
7-5/8REG 241.3 76.2 9.14or9.45 223.8
NC70-97 247.6 76.2 9.14or9.45 232.6
NC70-100 254 76.2 9.14or9.45 237.3
8-5/8REG 279.4 76.2 9.14or9.45 266.7
NC50-67 171.5 71.4 9.14or9.45 159.5



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