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Ashley Greene (in J. Mendel), Rachel Bilson (in Chanel) and Minka Kelly were among the stars at the Diamond Information Center and InStyle‘s 9th Annual Awards Season Diamond Fashion Show Preview. Held at the Beverly Hills Hotel, the luncheon featured more than 45 jewelers, including Lorraine Schwartz, Bulgari and Chanel Fine Jewelry, who lent gems to the A-list guests. “Diamonds are a girl’s best friend!” exclaimed Bilson, who designed an exclusive Everlon leather and diamond bracelet that can be purchased for $100 here.

See more highlights from last night’s chicest party.