Geneva

The increase was prompted by the sharp demand for Swiss watches made from precious metals.

The bright orange one-off could raise up to $88,000 for charity.

Both rare perpetual calendar chronographs will be sold at The Geneva Watch Auction: XIV in November.

Christie’s will sell the pair of bracelets, with 112 diamonds in total, at its Magnificent Jewels sale in November.

Phillips will sell the set—which includes two first-editions—at the Geneva Watch Auction: XIV.

Setting two world records in the process.

The ultra-rare timepiece is one of only three Ref. 2523 watches to feature a map of the Eurasian landmass.

“The Spirit of the Rose” set a record auction price for a purple-pink gem at Sotheby’s Geneva.

The wristwatch is derived from a “school piece” the master watchmaker created in the 1960s.