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THERE IS A NEW kitten among the cats at Cartier. A descendant of the panther pieces that have prowled the French jeweler’s house since 1914, this feline has a functional heartbeat, so to speak. The 62.48-carat oval ruby that the cat cradles is a hinged lid that flips open to reveal a watch.

The covetable piece is part of the Résonances de Cartier collection of high jewelry designed around the qualities of gemstones: their shapes and colors. “The serene attitude of the panther, lying down and protecting the stone, was inspired…