Amid the palm-tree-lined boulevards of Beverly Hills, only steps from Rodeo Drive and its flawless storefronts, sits the Martin Katz jewelry boutique. Here this mainstay of Hollywood’s red carpet displays an array of the captivating jewels that have won him a loyal following among celebrities and well-dressed Angelenos alike. His big break came when he lent a diamond choker and earrings to Sharon Stone for the Los Angeles premiere of Basic Instinct in 1992. “The film was a huge box-office success, and she became the biggest star in the world,” recalls Katz. “Quickly, I was inundated with red-carpet requests for awards seasons.” But there is more to Katz’s jewelry than striking diamonds. The designer has an eye for unusual stones and is quick to invest in large, lesser-known yet collectible gems, such as electric-blue Paraíba tourmalines, reddish-pink spinels, and bluish-purple tanzanite. He is as comfortable presenting elaborate million-dollar-plus designs as he is creating some of the best everyday pieces available—thin, stackable diamond-covered bangles and rings, for instance, or his newly introduced flexible metal-and-gemstone bracelet. “My work began as classic designs and became very whimsical and interpretive,” he says. “Now I am utilizing more complicated setting techniques and bringing a couture feeling to my collections.” His ability to deliver pieces that can be worn with everything from an evening gown to jeans and a T-shirt makes Katz a star in this town.