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“Can you believe how wonderful these all are?” purred Diana Ross as her longtime friend Diane von Furstenberg draped yet another oversized 18-karat gold chain-link bracelet from her collection, Diane von Furstenberg by H. Stern, on the legendary singer. Von Furstenberg celebrated her jewelry debut on both coasts — with a lunch on Friday at her Coldwater Canyon estate and a cocktail party on Tuesday in New York at H. Stern’s Fifth Avenue store.

On the West Coast, Kelly Lynch, Shiva Rose McDermott and Rhona Mitra talked jewelry and politics, while guests Cheryl Hines and von Furstenberg’s four-year-old granddaughter, Antonia, played with the merchandise. “Can’t you just see me holding the baby with this baby on?” mused Debra Messing, flashing the largest of the diamond-encrusted rings.

In New York, von Furstenberg’s pals Diane Sawyer, Anh Duong and Naomi Campbell eyed the baubles, while the designer revealed a favorite piece. “The power ring,” she said, pointing to an enormous rock. “Jewelry should also be a weapon.”

Downtown, royalty drew a crowd to Lars Bolander’s antiques store, where the Duchess of Marlborough unveiled an exhibition of her paintings. Guests shuttled back and forth to Soho House in hopes of glimpsing Hollywood prince Jude Law, who was hosting a Grand Classics screening of his film, “Alfie.” (The evening also celebrated Yves Saint Laurent’s new fragrance, Cinéma.) Among the revelers were Marisa Tomei, Ben Stiller and Christine Taylor, Debbie Harry and Debbie Bancroft, who, at her 50th birthday lunch the next day, admitted she may qualify as a Jude stalker. “I told him to plant one right here,” she swooned, pointing to her cheek. The prince obliged.