Jewelry

Wednesday, October 24, 2012

The most popular diamonds in the world

Akbar Shah Diamond
The rulers of the Mughal dynasty had a passion for chronicling their reign and almost every emperor in that lineage commissioned lavishly illustrated biographies. These documents have proved to be invaluable resources for later historians who have been able to use them to reconstruct the social and political events during the lives and times of the Mughal emperors.
These meticulously recorded volumes have been especially valuable in reconstructing the story of the historic Akbar Shah diamond. This fabulous gem, which once weighed 116 carats, is said to have borne two inscriptions in Persian. One referred to its first owner, Emperor Jahangir. According to the etching, the stone found its way into the Imperial Treasury of the emperor in 1619. A possible allusion to this can be found in the Tuzuk-i-Jahangiri(Memoirs of Jahangir). These records, either written in Jahangir's own hand or dictated to a scribe, cover the period of his reign(1605–27) and illustrate his glamorous lifestyle. Of his sojourn in Gujarat, it is recorded: On Friday the 5th, Bahram, son of Jahangir Quli Khan, came from the province of Bihar, and had the good fortunes to pay his respects. He laid before me some diamonds he had obtained from the mines at Kokhra.

It is likely that the Akbar Shah was among the array of diamonds that were presented to Jahangir. It is interesting to note that the memoirs make a mention of diamond deposits from the mine at Kokhra (present day Khukra, 64 km west of Ranchi)in the eastern state of Bihar. Apparently, these were not from a mine at all, but from a river bed that was fertile with diamonds. Though Jahangir's memoirs give a description of how large diamonds were also mined from this source, this area has rarely been given due credit by the diamond mining industry. In fact, it is hardly ever mentioned as a diamond rich region in India.

The second inscription on the Akbar Shah confirms that it officially became a part of Shah Jahan's treasury in 1629. It is widely believed by historians that this celebrated gem was set as one of the eyes of the peacock in the fabulous Peacock Throne. However, other scholars suggest the possibility of it being the dazzling diamonds encircled by emeralds and rubies, suspended opposite the throne. But there are yet other authorities who feel that the suspended gem was the Shah diamond.

The Allnatt Diamond is a diamond measuring 101.29 carats (20.258 g) with a cushion cut, rated in color as Fancy Vivid Yellow by the Gemological Institute of America. This diamond is named after one of its holders, Major Alfred Ernest Allnatt, a soldier, sportsman, art patron and benefactor. While it is not known precisely where the Allnatt originated, many experts believe that it was probably found in what is now known as the De Beers Premier Diamond Mine.
The Allnatt's origins are unknown prior to Major Allnatt's purchasing of the diamond in the early 1950s. After purchasing the diamond, he commissioned Cartier to make a setting for it. The final setting was a platinum flower with five petals, a stem and two leaves, all set with diamonds. The Allnatt was resold at auction in May 1996 by Christie's in Geneva for $3,043,496 US. At the time of its sale the Allnatt was 102.07 carats (20.41 g). and was graded Fancy Intense Yellow. After being sold to the SIBA Corporation, the diamond was re-cut to its current weight and the intensity was upgraded as a result.
The Allnatt was displayed as part of the Smithsonian's "The Splendor of Diamonds" exhibit, alongside The De Beers Millennium Star and The Heart of Eternity.

Cora Sun Drop Diamond
The Cora Sun-Drop Diamond is the largest yellow pear-shaped diamond known, weighing 110.3 carats (22.1 g). Being sold for $10.9 million it has set a world record for a yellow diamond.
The Sun-Drop has a very short history. It was found in South Africa in 2010 within a kimberlite pipe. Tests show that the diamond was formed from 1 to 3 billion years ago. After that, on 24 February 2011, it was kept in The Vault of the London Natural History Museum together with many other precious stones, such as the Duke of Devonshire Emerald and the Aurora Pyramid of Hope, where it stayed for six months. In November 2011, it was sold at an auction in Geneva for just over $10.9 million.[2] The stone was cut and owned by the diamond manufacturing company Cora International, based in New York. It was sold at the auction by Sotheby's Magnificent Jewels. The Sun-Drop was bought by a telephone bidder who decided to remain anonymous. Including commission and taxes the buyer paid $12.36 million. The pre-sale estimate was from 11 to 15 million dollars. "It sold for a record for a yellow diamond ... It was exactly within our expectation for this spectacular stone," said Mr Bennett, an auctioneer.

Saturday, October 13, 2012

Diamond Planet Has Found....!

Andrew Fazekas
Published October 11, 2012

The universe just got a bit richer with the discovery of an apparent diamond-rich planet orbiting a nearby star.
Dubbed 55 Cancri e, the rocky world is only twice the size of Earth but has eight times its mass—classifying it as a "super Earth," a new study says. First detected crossing in front of its parent star in 2011, the close-in planet orbits its star in only 18 hours. As a result, surface temperatures reach an uninhabitable 3,900 degrees Fahrenheit (2,150 degrees Celsius)—which, along with carbon, make perfect conditions for creating diamonds.
NASA's Spitzer Space Telescope collected data on the planet's orbital distance and mass, and resulting computer models created a picture of 55 Cancri e's chemical makeup.
"Science fiction has dreamed of diamond planets for many years, so it's amazing that we finally have evidence of its existence in the real universe," said study leader Nikku Madhusudhan, a postdoctoral researcher at Yale University.
"It's the first time we know of such an exotic planet that we think was born mostly of carbon—which really makes this a fundamental game-changer in our understanding of what's possible in planetary chemistry."
At only 40 light-years away, in the northern constellation Cancer, the gemlike planet sits relatively near Earth. In dark skies, 55 Cancri e's host star is clearly visible to the naked eye. (See gem pictures.)

Diamond Planet Has Odd Chemistry
The new models fit with previous studies that showed 55 Cancri e's parent star was abundant in carbon—much more so than our sun.
"If we make the assumption that the star and its surrounding planets are all born from the same primordial disk of material, then it makes sense that the entire planetary system would be carbon rich," said Madhusudhan, whose study will appear in an upcoming issue of the journal Astrophysical Journal Letters.
Princeton astronomer David Spergel believes the diamond-planet find probably represents the first discovery of a whole new class of planets whose chemistry has never been encountered. (Related: "'Diamond Planets' Hint at Dazzling Promise of Other Worlds.")
"Unlike our solar system, which is dominated by oxygen and silicates, this planetary system is filled with carbon," said Spergel, who was not involved in the new study.
"While it's still unknown exactly what implication this will have on our understanding of evolution of planetary systems," he said, "there's no doubt it is an important step towards understanding the full diversity of planets."

The Untold Story of the World's Biggest Diamond Heist