DercDerco Jewelers is committed to providing top quality diamonds and jewelry at exceptional prices, with a dedication to service unsurpassed in the industry. Established in 1939 with founder Krikor (Koko) Der Abrahamian and headquartered in San Francisco since 1979, Derco has a loyal, discerning customer base centered in the Bay Area that extends across the country and throughout the world.o Jewelers is committed to providing top quality diamonds and jewelry at exceptional prices, read full review »