← All Products

Gemworld Shop

Proceed to checkout

Colored Stone Grading and Pricing – Tucson, AZ

Color grading is presented following the new World of Color nomenclature and based on the international standard of the Munsell system. In this course, participants will examine and grade a variety of colored stones. The value of a colored stone is dependent on a number of factors both internal and external to the gem. As quality factors are discussed in this course, it will be done from the perspective of the identification and classification of specific traits as they relate to value. In 1982, Gemworld International developed a system for grading colored stones within the context of trade relevant terminology (i.e. Commercial, Good, Fine and Extra Fine). Today its 1 to 10 scale is an industry standard. Participants will examine more than 40 colored stone varieties to assess their quality and price based on the GemGuide pricing charts.

February 4, 2020
9:00am-1:00pm (This class is 4 hours.)

Subscribers’ fee: $295, non-subscribers’ fee: $345

Ventana Room
Tucson Marriott University Park Hotel
880 East Second Street
Tucson, AZ 85719