Egg-sized diamond sells for more than $21 million at Geneva auction

GENEVA (AP) — “The Rock,” an egg-sized white diamond described by Christie’s as the largest of its kind at auction, sold for more than 21.6 million Swiss francs ($21.75 million) on Wednesday. That includes fees – albeit at the low end of the expected range.

This 228-carat pear-shaped G-Color gemstone features a platinum pendant and weighs 61.3 g (2.2 oz) total and measures 5.4 cm x 3.1 cm (2.1 in x 1.2 in) – about the size of a medium egg.

G-Color is not the highest grade, but the fourth on the alphabetical rung below the top D-Color diamond.

An unspecified private buyer bought The Rock, with a pre-auction estimate of between 19 million and 30 million francs.

Max Fawcett, head of jewellery at Christie’s in Geneva, praised the successful sale of similar gemstones in “uncharted territory”.

Also up for auction on Wednesday was a “Red Cross” diamond, a 205.1-carat yellow-colored diamond, that sold for nearly 14.2 million francs, double the pre-sale estimate. The diamond was cut from rough unearthed at the Grigorand mine in South Africa in the early 20th century and was first auctioned in 1918.

Fawcett confirmed a “substantial interest” in Red Cross diamonds, saying an unspecified “seven-figure sum” of proceeds from the sale to an unspecified private buyer will be donated to the International Red Cross Movement, a Geneva-based humanitarian aid organisation.

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