As you have asked about the International School of Gemology, I am giving you information about it, check below for the details

It offers world class gemology training at the world’s lowest tuition rate
It was formed in the year 2004.

It is recognized by:
Texas Department of Insurance
National Association of Independent Insurance Adjusters
National Association of Jewelry Appraisers
American Gem Trade Association
Diamond Council of America
Jewelers of America
Manufacturing Jewelers and Suppliers Association
Cultured Pearl Association of North America
International Diamond Exchange
Polygon

It offers following courses:
Introduction to Watches
Pearls Course
Diamonds Course
Colored Gemstones
Gemology Tools and Techniques
Created and Treated Gems
Diamond Council of America Courses

Contact:
International School of Gemology
Educational Institution
Address:
14837 Old Bandera Rd,
Helotes, TX 78023, United States
Phone:+1 210-695-5520