Accredited Gem Appraisers


721 Sansom St.
Lower Level
Phila PA 19106

Email AGA

Diamond Education


Published in Feb 2008 Rapaport Magazine: The DFS system

"Levels of Confidence"
A pre-purchase, screening tool for the consumer. An explanation tool for the appraiser. Intended to gauge the credibility of represented color, clarity and cut grades compared to GIA or AGSL grading. Article by David Atlas.

Gemstones, Diamonds and Jewelry as Investments. Are you kidding or are you really serious?

Frequently Asked Questions

Technology Reaches Ever Deeper into the Diamond Business (pdf)

AGA vs. Holloway

Definitions: Brilliancy-Sparkle-Intensity

8 Star and the Ideal Scope

Standardized Diamond Grading

Detailed Comparison of Three Major Labs' Accuracy and Pricing

DIAMOND APPRAISERS: Why you need one and what to expect

Making the Case for Imagem Diamond Grading