“Oh, I hope nobody else bids on this! I want this,” the fashion designer Gabriela Hearst declares, caressing the massive David Webb necklace she is wearing as if it is the most casual of trinkets. This behemoth, a diamond “Demon Mask” necklace-brooch, features a carved nephrite mask of pre-Columbian inspiration adorned with a textured gold headdress, bezel-set cabochon amethysts, and a plethora of other spectacular stones. It is just one of the dazzling pieces that Hearst has curated from Sotheby’s upcoming High Jewelry sale, taking place December 9 in the house’s new digs in the Breuer building on Madison Avenue. (You know the place, the boxy stack of rectangles that used to house the Whitney Museum.)

This is the first time Sotheby’s has collaborated with a designer, and Hearst says

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