Any recommendations for a Jeweler in San Francisco?

There's David Clay in Cow Hollow and Opus just south of Market--if I were you though, I would go to the East Bay for jewelry. In SF you end up paying for high rents and other location related extra fees. In the East Bay, you can get big ticket items for a lot less. When I was getting married I went to Shane Company in Walnut Creek and I think I save at least a few hundred over what I would have in the City.