About AGA
Precision in Every
Gemstone.
American Gemological Appraisal — based in Midtown Manhattan. Certified valuations for insurance, resale, estate, and legal purposes.
AGA specializes in the appraisal and authentication of fine jewelry, diamonds, and luxury timepieces. We deliver precise, defensible valuations trusted by wholesalers, retailers, and private clients across the United States. Our work is grounded in accuracy, transparency, and current market intelligence.
Every item undergoes a thorough inspection by our GIA-trained gemologists. We evaluate metal composition, hallmark verification, stone identification, carat weight, color and clarity grading, cut assessment, and overall condition — identifying treatments, alterations, and authenticity markers.
Every AGA appraisal includes a professionally prepared certificate registered in the AGA database and embedded with a unique QR code — allowing insurers, buyers, and owners to instantly verify authenticity, grading data, and appraised value from any device.
AGA certificates are recognized by major U.S. insurance carriers for jewelry scheduling, claims processing, and replacement coverage. Our reports include all documentation required by insurers, and are suitable for estate settlements, resale, charitable donations, and legal proceedings.
AGA operates exclusively as an independent appraisal service. We do not purchase, sell, or broker jewelry or gemstones — ensuring complete objectivity in every valuation. All reports are prepared by credentialed gemologists free from any conflict of interest.
Professional Notice: American Gemological Appraisal operates as an independent appraisal service. All reports are prepared by credentialed gemologists in accordance with accepted industry standards and are intended for use with insurance providers, private clients, resale transactions, and legal purposes.