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Located in the San Francisco Gift and Jewelry Center, Derco is one of the most trusted and popular fine jewelers in San Francisco in Derco holds one of the  largest selection of fine quality diamonds in the bay area, most of which are graded by the Gemological Institute of America(GIA). Visit our showroom to learn about the 4Cs of Diamonds with our expert sales staff so that you can fully understand the  value of your diamonds. A diamond is forever. Derco makes it easy for you to find one of lasting value that will enchant your family for generations