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Gem Data

Health Care

GEM DATA offers independent gemological appraisals, gem identification, jewelry and luxury watch valuations, and acquisition consulting from the historic Shreve Building, Union Square, San Francisco. Established 1981.

Hours

• By Appointment Only

Agents: this record as JSON → /api/v1/us/ca/san-francisco/gem-data-760-market-st-920.json

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Sources: BrightQuery (CDLA-Permissive-2.0); business website read 2026-10-14. About our data.