GENEVA (AP) — A blue diamond weighing nearly 10 carats has sold at auction in Switzerland for 20.5 million Swiss francs ($26.6 million) including fees.

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The pear-shaped 9.51-carat “Mellon Blue” — named for the late American arts patron Rachel “Bunny” Mellon — had been expected to fetch $20-$30 million at the Christie’s auction on Tuesday.

The house said the stone came in on the estimated range. The final price includes the “buyer’s premium” and other fees.

“Not the dazzling moment I expected,” said Tobias Kormind, managing director of online jeweler 77 Diamonds. He said the gem was “tipped as the season’s headline act” but was weighed down by a broader market mood.

“Geopolitical tensions — from the war in Ukraine to Trump’s tariffs — and a weakened Chinese economy that

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