Has blingmaster-to-the-stars Jacob the Jeweler met his match? Celebs in search of custom-designed red-carpet baubles are snapping up edgy pieces by upstart Daniel K. Founded by 30-year-old Daniel Koren, the NYC-based luxury diamond house recently fashioned a right-hand ring for newly single Halle Berry; other stylish fans include Mary J. Blige and Debra Messing. ''My diamonds are fresh and youthful -- they make a statement without being decadent about it,'' says Koren, who cites art deco architecture as a source of inspiration. ''It may be a $1 million necklace, but it works with a sports jacket, suit, or gown. It's not something you wear once and lock up in a safe somewhere.'' Or hand to your personal bodyguard.