A tiny store teeming with original and inspired jewelry.. In Short There's no sign outside Zen, one of San Francisco's coolest jewelry shops. Inside, you'll find an overwhelming selection of rings, bracelets, necklaces, earrings and pendants. Every wall is dripping with jewelry. The prizes are original and stunning--owners Bruno and Tina create most of the designs. Coral with Tibetan turquoise, amber, black onyx and silver--their collection is hip yet imaginative, decadent yet affordable.