ISG – The International School of Gemology is a one-man-show operated by gemologist Robert James of Helotes, Texas. Notorious for spreading false information about mythical non-existent gemstone treatments such as “dyefusion” and “color infused” which have been widely debunked by respected gemological experts such as Chris Smith of AGL New York and the AGA – Accredited Gemologists Association, ISG should be avoided by anyone serious about a genuine education in gemology.

Offering fancy sounding titles such as RG – Registered Gemologist and RGA – Registered Gemologist Appraiser, ISG is widely regarded as a “Diploma Mill” as these titles are not recognised anywhere in the gem and jewelry trade.