World Gem Foundation
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Coloured Gemstones Course


Level One - None



Course Objective

This course concentrates on the twenty-six most common groups, species and varieties of coloured gemstones giving a comprehensive overview of their physical and optical properties, their unique identifying features, and how they are graded.

Topics Covered Include

Physical properties, geology, localities, crystal system, chemical composition and causes of colour, varieties, absorption spectra, pleochroism, inclusions, fluorescence, gem identification, synthesis, common treatments and enhancements, and care guidelines. Gemstones covered in this course include corundum (rubies and sapphires), beryl (emeralds, aquamarines and other precious beryl), chrysoberyl (alexandrite and other chrysoberyl), spinel, zircon, topaz, tourmaline, peridot, quartz, garnet, tanzanite, lapis lazuli, turquoise, opal, jade, spodumene (kunzite and hiddenite), feldspars, iolite, andalusite, diopside, apatite, and organic gems (pearls, coral, jet, ivory, and amber).

Coloured Gemstone Grading

You will learn how to accurately describe colour based on hue, tone and saturation, the various colour grading systems currently used by professionals, the clarity classification of gemstones based on their geological environments, how cut is assessed, opal, jadeite and pearl grading, and how weight is assessed in a 'mounted' coloured gemstone.

Tests and Examinations

This course includes five online tests after lessons four, ten, sixteen, twenty-five and thirty.

Course Credits

Program and
							Course Flow Chart

Upon the successful completion of this course you will receive course credits towards both the Career Gemmologist Diploma and Coloured Gemstone Professional Diploma Programs.

Long Distance Learning

This course is available for long distance learning. You can register at any time and study at your own pace. There are no time restrictions.

This course includes five (5) hours of online tutoring from one of our instructors. Once you have registered, you will receive an email detailing how you can choose your tutoring hours. You can also request additional tutoring hours if necessary.

Cost (Digital): $ 550 (USD) / € 500 / 450 GBP

Printed Version

Our courses are also available in print. Please contact us for more information.