Charm of diamonds across the world is very enchanting, and the interest increases manifold if the precious stone involves rarity. One such record breaking 302.37 carat emerald cut diamond, which is the largest, 'highert clarity, highest colour ever graded', is ready for sale but it is so expensive that price tag has not been put on it, a Daily Mail report said. 

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The rare diamong piece found in Botswana is known as "Graff Lesedi La Rona". The massive gemstone weighs 302.37 carats and it reportedly was carved from a 1,109 carat rough diamond found in 2015, said the report, adding that a London previous stones dealer is looking to sell the world's largest square emerald cut diamond. The dealer is has refused to discuss the price. 

According to the report, the Graff Lesedi La Rona diamond is colourless  - which increases its value further. The Gemological Institute of America has reportedly described the precious stone as the 'largest, highest clarity, highest colour diamond ever graded' by the organisation. 

The report said that Graff paid $53 million for the rough stone and spent the next 18 months working on it, adding that the stone was the second largest every discovered.  

Daily Mail quoted Graff chairman Laurence Graff as saying "My love affair with diamonds is life-long and crafting the Graff Lesedi La Rona has been an honour". "This diamond, our diamond, is beyond words. All our expertise, skill and accomplishment went into crafting this incredible diamond masterpiece, which is extraordinary in every way," he was further quoted.

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Notably, Lesedi La Rona means 'Our Light' in Tswana, the main language of Botswana, the report added.