Diane Christensen, CGA
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Last updated: 11/26/2019
Diane Christensen, CGA
Certified Gemologist Appraiser
Professional Information
Christensen & Rafferty Fine Jewelry
100 S Ellsworth Ave
Ste 607
San Mateo
94401-3928  United States
 [ Map ]
650 344-9535 (Phone)
650 344-9646 (Fax)
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Additional Information
  2018 Nashville
Annual Certification, Certified Gemologist Appraiser

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

8881 W. Sahara Ave. Las Vegas, NV 89117

info@ags.org (866) 805-6500