WHO, WHAT, WEARABLE Bezels & Bytes   Created expressly for Fitbit fitness trackers, the initial collection from San Francisco tech jewelry brand Bezels & Bytes comprises trendy bracelets (which hold the tiny Fitbit Flex) and metal charms (designed to dress up the sporty Fitbit Charge HR)—perfectly in step with young, tech-savvy fashion shoppers.   What we liked: The pieces—including a beautiful sculptural cuff (pictured), classic leather wrap bracelets, and a metal ID bracelet (all in 12k gold- and rhodium-plated brass)—are substantial but wallet-friendly: Charms retail for $30, and bracelets $78–$98. What we didn’t like: Due to the high shine of the rhodium plating, the silver-toned pieces look slightly less luxe. An oxidized rhodium option might be the answer. Best feature: The hatches that hold the Fitbit Flex are discreet and secur