Top Service Rating - 5 Stars - Certified Merchant

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Explore the Difference

Unlike most Internet jewelers, at Diamond Design Co. each piece of jewelry is carefully designed and crafted by our in-house jewelers.

Need it wider, smaller, more stones, less stones, a different metal or precious stone, NOT A PROBLEM. Our jewelry is made-to-order-, "made by us for you".

Fine quality jewelry should come with fine quality service

Contact Information

Diamond Design Co.

760 Market Street, Suite 357 Map Location
San Francisco, California 94102

Photo of the Phelan Building at nightEmail:

We are located in the heart of San Francisco, near Union Square, inside the Historic Phelan Building. We love this location because it is not only in beautiful downtown San Francisco, but also we're close to many restaurants, shopping, and easy access to transportation. BART (Powell St. Station), Muni, Market Street Trolley and Cable Cars are just steps away. Please come visit us.

By Appointment Only
415.956.2519 (fax)
1.866.488.3326 (toll free)



San Francisco City Search Profile


760 Market Street, San Francisco CA


Check Bart ScheduleCheck the BART Schedule, Powell Street station at Union Square


CAD design for test drive your ring

Test Drive Your Ring

The ultimate in jewelry buying experience. Test drive your ring puts you in the drivers seat. Your ring, your way. Learn More

Jewelry CAD Design System

Advanced Design Technology

Quality you can trust from Diamond Design Co. We make each piece to your exact specifications. See our videos. Learn More