From the origins of the name, to their formation within the earth's crust, to the mistaken belief that they are purveyors of bad luck to the optical phenomenon that produces such a mesmerizing and tantalizing array of spectral colours and patterns, opal is indeed a 'stone of mystery'.
Jade, on the other hand, is not only desired and valued for its beauty but also for the unique and venerable position it has held in the cultural fabric of many great and storied civilizations, from the Chinese empire, where it was once considered its most valuable commodity, to the pre-Columbian civilizations of the Olmec, Maya, and Aztec of Central America (Mesoamerica), who valued it more than gold, to the Maoris of New Zealand.
Topics covered in the course include their physical and optical properties, geological formation, crystal systems, chemical composition, varieties and classification, cause of colour, absorption spectra, common inclusions, fluorescence, mining, grading criteria, methods of synthesis, gem identification, common treatments and enhancements, cleaning and care instructions, and pricing.
This course includes one online test at the end of the course.
This is a 'General Interest' course. After completion, students may upgrade to 'Coloured Gemstones' and receive a credit equal to the value of the cost of this course towards Coloured Gemstones.
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.
If you reside outside of Holland, please contact DGA at firstname.lastname@example.org for more information.