Naturally Colored Diamond Blog

Two Famous Colorless Diamonds

Posted by Tony Cathaway on 6/17/16 8:00 AM

It's no secret that diamonds are made out of highly organized carbon molecules. Geologist suggest that these stones formed anywhere from one to three billion years ago. Diamonds are made by pressing carbon dioxide at 725,000 pounds per square inch, 100 miles below the surface of the earth. At this depth, temperatures reach over 2,000 degrees Fahrenheit. After quickly being pushed back to the surface of the earth, a diamond is formed.


 Nearly 99% of all diamonds found are colorless. The Gemological Institute of America grades these diamonds on their hue from a scale of D to Z, with a grade D diamond being the purest of the colorless stones. Although colorless diamonds aren’t hard to find, discovering a diamond the size of the Cullinan and the Centenary Diamond happen only once in a blue moon. 

The Cullian Diamond

Cullinan-colorless-diamonds.jpgImage Source The South African

On January 26, 1905, the owner of the Premier Diamond Mines in South Africa, Sir Thomas Cullinan, was present during the discovery of the largest rough diamond in the world. His superintendent, Frederick Wells, was routinely inspecting the mine when a shiny object caught the corner of his eye as the sun slowly set. After a quick extraction, the Cullinan diamond was found. This mammoth diamond weighed 3,106 carats, and the cutters at I. J. Asscher & Co. split the diamond into 9 large pieces and 100 smaller pieces, each cut and polished into different shapes and sizes.  This diamond was so large and tough that when Mr. Asscher went for the initial cut with a steel cleaver blade, the blade broke and the diamond was undamaged!

The diamond was presented to King Edward VII on November 9th, 1907 by the Transvaal government, also known as the South African Republic. The King then asked the trustworthy Mr. Asscher to handle the cutting. Each of the nine large pieces are now either part of the British Crown Jewels or in the control of the Royal Family. Of all the pieces, the Cullinan I is the largest, weighing 530.20 carats in its pear shape. The Cullinan I is set in the Sovereign’s Sceptre with Cross while the Cullinan II is set in Imperial State Crown. This cushion-cut stone weighs an enormous 317.4 carats. The remaining pieces weigh less than 100 carats each, and in its whole, the Cullinan diamond is worth over $2 billion.

The Centenary Diamond

_1070782_bigdiamond300.jpgImage Source BBC

The De Beers Group is one of the leading diamond exploration and mining businesses worldwide. In their possession is the Centenary Diamond, worth an estimated $100 million dollars. The modified heart-shaped brilliant cut diamond weighs 273.85 carats, originally weighing 599 carats in the rough in the year 1986. This is the third largest diamond out of the Premier Mines, with a grade D clarity and rated internally and externally flawless. Since the value of the diamond is extremely high, the cutting of the diamond had to be in the perfect environment. De Beers employed a security detail, built an advanced underground room with minimal mechanical vibrations and temperature variation, and hired one of the world’s most renowned diamond cutters, Gabriel Tolkowsky. After 2 years of work, the Centenary Diamond was revealed with 247 facets with 83 on its girdle and 164 on its pavilion and crown. The design on the Centenary Diamond makes it the largest modern fancy cut diamond in the world, and the only stone to use complex, modern cutting technology with old cutting techniques.  This diamond to current date is valued at over $90 million.

To read more about famous diamonds, see the pieces below:

Naturally Colored Diamonds

Topics: History


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