Five days/ three days per week/ 12.00 to 5.00 pm. only.
Can be completed in a shorter period by request-slot availability.
No assignments/ examinations.
Course contents similar to the Diploma Course.
Participation certificate will be awarded only.
Topic to be covered :-
Introduction : Formation of minerals, basic qualities (beauty, rarity, durability), classification of gem materials, weights and measures.
Physical characteristics of gemstone : Hardness, Cleavage, Fracture, Parting, Specific Gravity, Estimation of Heft of a gem material.
Crystallography : Nature of crystal, Elements of symmetry, Crystal System, Forms, Habit, Twinning, Surface markings, Identification of Rough.
Magnification : Inclusions- Their nature and importance in identification.
Optical Characteristics : Nature of light, Electromagnetic Spectrum, Transparency, Light Reflection and Refractive Index and its measurements, Phenomenal effects Chatoyancy, Asterism, Sheen, Aventurescence, Play of colour, Change of colour etc. Reflectivity, Colour and its causes, Pleochroism, Dispersion, Absorption Spectroscopy, Luminescence, Application of Ultra Violet, X-rays and Infra-red rays in Gem Identification.
Other Properties : Electrical and magnetic properties, Thermal Conductivity, Surface Tension & Cohesion.
Instruments Used In Gem Identification : 10xLens, Microscope, Polariscope, Dichroscope, Refractometer, Visible and Spectrometer, Ultra Violet Light, Specific Gravity by Hydrostatic method and liquid immersion, Chelsea Colour Filter, G.M Counter, Hot Point, etc.
Synthetic, Composite and Imitation Gemstones:
Method of synthesis, Stones synthesized, Identification techniques, Characteristics, Manufacturers and trade names.
Gem Enhancement Methods and their Identification : Colourless/Coloured impregnation, Heat Treatment, HPHT, Graphitization, Coating, Irradiation, Diffusion Treatment(Traditional & Beryllium), Foiling & Laser Drilling etc.
