David C. Rotenberg, ECGA
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Last updated: 2/19/2020
David C. Rotenberg, ECGA
Emeritus Certified Gemologist Appraiser
Professional Information
David Craig Jewelers Ltd.
10 Summit Square Ctr
19047-1078  United States
 [ Map ]
215 968-8900 (Phone)
215 579-2377 (Fax)
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Additional Information
  2019 Seattle
Annual Certification, Certified Gemologist Appraiser


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Mission Statement

The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

American Gem Society

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info@ags.org (866) 805-6500