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Provides colored gemstone identification and grading reports. They offer four levels of reports including the Prestige Report, which is considered by many to be the best in the industry for colored gemstones. Based in New York, New York USA...
http://www.aglgemlab.com/
Offers colored gemstone, colored diamond, and pearl reports of varying detail. AGTA also sponsors the largest high-end gemstone show at the Tucson Gem and Mineral Show each year. Based in New York, New York and Dallas, Texas USA...
http://www.agta.org/gtc/services.html
Provides diamond and colored gemstone grading reports and education. The GIA is best known for their development of the most widely used diamond grading system. Based in New York, New York and Carlsbad, California USA...
http://www.gia.edu/gemtradelab/31494/section_main_page.cfm
Offers programs to become a registered gemologist or appraiser with classes in diamonds, colored gemstone grading and identification, identification of synthetic gemstones, pearls, watches, and jewelry insurance appraisal. Their lab is well known for discovering the artificial coloring of andesine-labradorite that has been flooding the television shopping shows recently. Their new studies on diffused tourmaline in the Gem Research Reports is a must read. Based in San Antonio, Texas USA....
http://www.schoolofgemology.com/