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The 4-inch (10-centimeter) tall egg is made from finely carved rock crystal, covered in a delicate snowflake motif wrought in platinum and 4,500 tiny diamonds. It opens to reveal a removable tiny basket of bejewelled quartz flowers symbolizing spring.

The sale price, which included a buyer's premium, topped the $18.5 million paid at a 2007 Christie’s auction for another Fabergé egg created for the Rothschild banking family.

Craftsman Peter Carl Fabergé and his company created more than 50 of the eggs for Russia’s imperial family between 1885 and 1917, each elaborately unique and containing a hidden surprise. Czar Alexander III started the tradition by presenting an egg to his wife each Easter. His successor, Nicholas II, extended the gift to his wife and mother.

Czar Nicholas II commissioned the egg for his mother, Dowager Empress Maria Feodorovna, as an Easter present in 1913. It was one of two eggs created by female designer Alma Pihl; her other egg is owned by Britain’s royal family.

The Romanov royal family ruled Russia for 300 years before the 1917 revolution ousted it. Nicholas and his family were executed in 1918.

Bought by a London dealer for 450 pounds when the cash-strapped Communist authorities sold off some of Russia’s artistic treasures in the 1920s, the egg changed hands several times. It was believed lost for two decades until it was auctioned by Christie’s in 1994 for more than 7 million Swiss francs ($5.6 million at the time). It sold again in 2002 for $9.6 million.

Each time the egg has sold, it has set a world record price for a Fabergé item, Christie's said.

Margo Oganesian, the head of Christie's Russian art department, called the egg “the ‘Mona Lisa’ for decorative arts," a superb example of craft and design.

There are 43 surviving imperial Fabergé eggs, most in museums.