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Known for their outstanding customer service, Mark Allen Jewelers has become one of Northern California’s premier jewelry retailers. Specializing in bridal jewelry, we have hundreds of engagement rings and wedding rings to choose from as well as an extensive collection of loose diamonds certified by GIA and AGS. If it’s a piece of fashion jewelry wedding rings, or fine jewelry you’re looking for, we have a large selection of both unique and classic styles featuring both diamonds and colored gem stones.