MJSA. Professional excellence in jewelry making and design.

Gem Certification & Assurance Lab Inc. (GCAL)

580 Fifth Avenue, Suite LL-05
New York, NY 10036

GCAL offers a unique suite of certification, identification, valuation, and forensic services for diamonds, gemstones, and jewelry.

Contract Services Offered

Assaying Services

What types of testing do you provide? X-ray Fluoresence
What types of materials can you test? Precious metal alloys, base metal alloys, glass, crystal.
What is your delivery time frame (from receipt of sample)? 2-3 days.
Are you accredited by the Consumer Product Safety Commission? No.
Do you allow customers to witness the processing of the lot and obtain a sample? No.

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