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Practice with hundreds of stones to learn many of the identification techniques used by experts. Use gem-testing instruments to identify gemstones, separate natural gems from synthetics, and detect treated gems. Find out how - and when - to use gemological laboratory services. Learn how to use gem identification skills to protect your business from costly mistakes.

To complete this course you must have access to gem tweezers, a 10X loupe or microscope, refractometer with polarizing filter, optic figure sphere, dicroscope, polariscope, and spectroscope. These instruments are not included with the course materials, and must be acquired separately. Or, you can practice with these professional tools by enrolling in GIA’s Student Workroom. For complete student workroom activities, hours, and fees, please call GIA Florence:
Tel. +39-055-215964, Fax +39-055-2655522 or info@giaflorence.com

Prerequisite: Colored Stones
Course content:

Introduction
General observation
Refraction and the refractometer
Polariscope testing
Pleochroism and the dichroscope
Magnification
Selective absorption and the spectroscope
Fluorescence and Phosphorescence
Additional tests
Separation and identification
Separating natural gems from synthetics and imitations
Detecting gem treatments
Separating red, pink, and purple gems
Separating blue and violet gems
Separating green gems
Separating orange, yellow, and brown gems
Separating colorless, white, gray and black gems
Identifying rough gems, parcels and mounted gems
Advanced laboratory testing
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