Gemology 101- How to Grade Colored Gems

June 9th, 2010 by James L. Sweaney, CGA, FGA. GG
Gemology 101 Intro

Gemology 101 Intro

Finally, after much hard work and thought, we've launched, or rather relaunched our Mardon Colored Stone Grading System. Last year we posted most of this system along with our Gallery of Gems, but were never really satisfied with the format.

Our excellent local internet consultants, Frye/Wiles, suggested a more internet-friendly way of presenting the system to our audience. They helped us create main sections for color, clarity, cut, etc., then broke each section into its basic parts and placed these on an easy-to-use tool bar.

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