The Diamond Cellar is hosting its star-studded Designer's Gala this weekend to kick off the holiday season. The annual event, held at the Columbus-based company's Sawmill Road store, is open to the public Dec. 2 and Dec. 3. Shoppers are sure to be dazzled by the expanded collections-including celebrity-worn pieces-brought by jewelry makers. But the real highlight is mingling with the designers themselves, including Michael Bondanza and Christopher Slowinski. "We want to sell," said Diamond Cellar Marketing Director Jen Walker. "But it's also an opportunity to see really, really special, one-of-a-kind pieces."