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15 of the world's rarest diamonds available to buy

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De Grisogono flawless D-colour diamond

Image courtesy of De Grisogono

To celebrate its 25th anniversary, Geneva-based fine jewellery house De Grisogono is partnering with Christie's to offer the largest flawless D-colour diamond ever to come to auction. Weighing in at a huge 163.41 carats, the IIA type diamond was cut from a 404 carat rough discovered in the Lulo mine in Angola in February 2016 and took 11 months to cut and polish into the final dazzling emerald-cut stone. The diamond is currently set as the centrepiece of an asymmetric necklace featuring a further 18 diamonds and two rows of pear-cut emeralds which took 14 craftsmen around 1,700 hours to create. The necklace, whose estimated price is as-yet undisclosed, will be auctioned as the star lot of Christie's Magnificent Jewels sale in Geneva on November 14, 2017 while the Art of De Grisogono partnership will see a number of other important stones from the house be offered throughout Christie's Autumn season.

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