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LONDON — A rare crystal and diamond Fabergé egg crafted for Russia’s ruling family before it was toppled by revolution is going up for auction, valued at more than $26.4 million.

Christie’s auction house says the Winter Egg is one of seven of the opulent ovoids remaining in private hands. It will be offered for sale at Christie’s London headquarters on Tuesday.

The 4-inch-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 bejeweled quartz flowers symbolizing spring.

Margo Oganesian, head of Christie’s Russian art department, likened it to a luxurious Ki

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