GENEVA — Christie’s says “The Rock,” an egg-sized white diamond billed as the largest of its kind to go up for auction, sold Wednesday for more than 21.6 million Swiss francs ($21.75 million), including fees — though at the low end of the expected range.

The 228-carat pear-shaped G-Color stone, with its platinum pendant mounting, has a gross weight of 2.2 ounces and dimensions of 2.1 inches by 1.2 inches — making it about the size of a medium hen’s egg.

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

An unspecified private buyer acquired The Rock, for which the pre-auction estimate was between 19 million and 30 million francs.

Max Fawcett, head of jewelry at Christie’s Geneva, hailed a successful sale in “uncharted territory” for a stone of its kind.

Also going under the hammer Wednesday was the “Red Cross” diamond, a 205.1-carat fancy yellow stone, which fetched nearly 14.2 million francs, double the pre-sale estimate. The diamond was cut from a rough stone unearthed from South Africa’s Griqualand mines in the early 20th century, and went up for auction for the first time in 1918.

Fawcett testified to a “huge amount of interest” in the Red Cross diamond, saying that an unspecified “7-figure sum” from the proceeds of the sale to an unspecified private buyer would be donated to the international Red Cross Movement, the Geneva-based humanitarian aid group.

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