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Course
Professional Gemologist
International Gem Society
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The International Gem Society (IGS) was one of the first online schools of gemology to serve a global audience. Our goal is to provide a flexible and affordable education in gemology. IGS's founder, Donald Clark, CSM IMG, created a robust testing process to ensure that those with IGS certification would stand out in the crowd. IGS continues to use the testing process created by Donald Clark to ensure continuity and rigor.
Identify GemstonesUsing Instruments and Testing ProceduresClassify GemsBy Crystal System Mineral Habit and FormationApply Gemological TerminologyTo Gems Jewelry and SettingsOperate Gemological InstrumentsIncluding Loupe Microscope Refractometer and PolariscopeEvaluate Gemstone Optical PropertiesIncluding Color Change Phenomena and Refractive IndexEvaluate Gemstone Physical PropertiesIncluding Hardness Specific Gravity and MagnetismConduct Destructive Gemstone TestsIncluding Acid Scratch Streak and Dye TestingIdentify Gemstone InclusionsIn Natural Synthetic and Enhanced StonesRecognize Gemstone Enhancements and TreatmentsIncluding Heat Radiation HPHT Coating and DiffusionPerform Gemstone Color GradingBy Hue Tone and SaturationPerform Gemstone Clarity GradingFor Colored Stones and DiamondsGrade Diamond Cut Color and ClarityUsing Standard Grading ProceduresDistinguish Natural From Synthetic GemsUsing Visual and Instrumental MethodsIdentify Phenomenal and Unique GemstonesIncluding Optical Effects and Special PropertiesEvaluate Gemstone Cutting StylesIncluding Faceted Cabochon and Carved