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Gem Data

Appraisal Service

Address210 Post St Ste 918, San Francisco, CA 94108

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

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