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As an appraiser of gemstones and jewelry, Cos Altobelli helped to develop a formal appraisal education program in 1983, now recognized throughout the world. He became the first person to receive the Certified Gemologist Appraiser title (CGA) by the American Gem Society and to date has certified more than 700 appraisers in the US and Canada. He also received the International Society of Appraisers (ISA) designation and the prestigious title of Graduate Gemologist.

Mr. Altobelli has been interviewed on NBC, CBS, ABC, and CNN as well as several local Los Angeles area radio and television stations. "ABC’s PRIME TIME” with Diane Sawyer utilized Cos’s talents and expertise in a segment concerning the misrepresentation and the shady misdoings regarding the business of selling precious stones.

COS ALTOBELLI – Curriculum Vitae

President – Altobelli Jewelers 1974 to present
Jeweler – Actively engaged more than 43 years as a platinum, gold, and silversmith, watch and clock maker, jewelry designer, mold maker, wax carver, engraver, diamond and colored stone setter, caster and polisher.
Forensic Appraiser – Experienced in jewelry, gemstones, carvings, minerals, antiques, watches, clocks and coins.
Business, security, and inventory analyst.
Expert Witness – testified in over 100 civil and criminal cases.
Helped Kuwaiti Government when asked for appraisals on lost Jewelry during the Gulf War.
Lectures, Seminars and Conferences
American Gem Society
American Society of Appraisers
California Jewelry Association
American Gem Trade Association
Gemological Institute of America
International Society of Appraisers
National Association of Jewelry Appraisers


Woodbury University
Gemological Institute of America – resident program
Degrees – Graduate Gemologist – Gemological Institute of America
Certified Gemologist – American Gem Society (AGS)
Certified Gemologist Appraiser (AGS)


American Gem Society, AGS named their library The Cos Altobelli Library – 2011
AGS“The Practical Guide to Jewelry Appraising” 2000-2009 -three editions
AGSThe addendum to The Practical Guide to Jewelry Appraising – 2002
AGS“Handbook of Gem and Jewelry Appraising” – 1986
AGS“Jewelry Appraisal Guidebook” – 1981


Distinguished Service Award to the Appraisal Profession
Retailer Hall of Fame
American Gem Society – Robert M Shipley Award
Most Outstanding Contribution in the Appraisal Profession

GIA League of Honor

Click to download complete Curriculum Vitae (PDF)