Dutch Gem Academy
At A Glance Career Gemmologist Diploma Program

Career Gemmologist Diploma Program

Program and
						Course Flow Chart

Course Objective

In the theoretical part of this course, you will learn all about the various instruments used to identify gemstones, the scientific principles they are based upon, how to distinguish imitation and lab-created gemstones from their natural counterparts, how to detect the various treatments used to improve the appearance and/or value of gemstones, how gemstones are mined and cut, the grading procedures for diamonds and coloured gemstones, the identification of gemstones, advanced gem testing techniques and a comprehensive overview of twenty-seven of the most popular gem species found in the gem and jewellery industry.

Topics Covered Include

The chemical nature of gemstones, their physical and optical properties, basic crystallography, the absorption of light, the spectroscope, refraction, reflection and the refractometer, polarized light, the polariscope, pleochroism, the dichroscope, colour filters, specific gravity, luminescence, magnification, thermal conductivity, imitation, assembled and lab-created gemstones, the methods used to manufacture lab-created gemstones including Verneuil, Czochralski, flux melt, hydrothermal, skull crucible, zone melt, horizontally oriented crystallization, high pressure, high temperature (HPHT), chemical vapour deposition (CVD), detonation, ultrasonic cavitation, sublimation method, and modified Stober method, their unique identifying features, treatments and enhancements including heat treatment, surface and sub-surface diffusion, lead glass fracture filling, flux assisted partial fissure healing, glass fracture filling, cobalt doped glass filled sapphires, high heat & pressure (HT+P), clarity enhanced diamonds, high pressure, high temperature (HPHT), quench-crackling, surface modifications, coatings and foil backs, laser drilling, and irradiation, gem mining and cutting, diamond and coloured gemstone grading, gem identification by colour and transparency, advanced gem testing techniques and a comprehensive overview of the twenty-seven most common groups, species and varieties including diamonds, corundum (rubies and sapphires), beryl (emeralds, aquamarines and other precious beryls), chrysoberyl (alexandrite and other chrysoberyl), spinel, zircon, topaz, tourmaline, peridot, quartz, garnet, tanzanite, lapis lazuli, turquoise, opal, jadeite, kunzite and hiddenite, feldspars, iolite, andalusite, diopside, apatite, pearls, coral, jet, ivory and amber.

Practical Workshops

This program consists of five practical workshops (Gem Identification #1, Gem Identification #2, Diamond Grading & Lab-created Diamonds, Coloured Gemstone Grading #1 and Lab-created & Treated Gems) requiring the completion of one hundred and sixty-eight (168) hours of practical instruction plus our sixty (60) hour online Coloured Gemstone Grading #2 course.

Tests and Examinations

This program includes twelve online tests, two preparatory coloured gemstone practical examinations (each consisting of ten stones), one final coloured gemstone practical examination (consisting of twelve stones), a practical diamond examination (requiring the preparation of complete lab reports for four diamonds), two 100 question theoretical multiple-choice examinations and two theoretical five essay question examinations.


Upon the successful completion of this program, graduates will receive three diplomas (Career Gemmologist, Diamond Professional and Coloured Gemstone Professional).

Long Distance Learning

The theoretical components of this program are available for long distance learning. You can register at any time and study at your own pace. There are no time restrictions.

This program includes fourteen (14) hours of online tutoring from our Dutch Gem Academy 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 through your DGA tutor if necessary.

For students choosing this option, the practical classes are offered at the Dutch Gem Academy (DGA) and require two hundred and twenty-eight (228) contact hours to complete. The costs for the 'Digital' and 'Printed' course options include the cost of the five practical classes and our 60-hour online Coloured Gemstone Grading #2 class.

Cost (Digital): € 6400 (Euros)

Cost (Printed): € 6715 (Euros) including shipping

Calendar: Dates practical classes are offered.


If you reside outside of Holland, please contact DGA at information@dutchgemacademy.com for more information.