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14 of the world's rarest diamonds available to buy

1 of 14 1/14

The Dynasty diamond

Image courtesy of Alrosa

Unveiled by Russian mining company Alrosa in August, the 51.38 carat Dynasty diamond (pictured centre) is due to go under the hammer along with four orbital stones - all cut from the 179 carat Romanovs rough diamond - in November 2017. Claimed by the company to be the purest large stone manufactured in Russian jewellery history, the sizeable gem has been rated Triple Excellent for polish, symmetry and cut with a D Colour and VVS1 clarity grading, just fractionally below flawless. Unusually the diamond is set to be sold through an online auction, rather than with a traditional auction house, and Alrosa estimate it could become the most expensive diamond sold in Russia's history with starting bids expected at no less than $10 million.

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