We at INDRAPRASTHA GEM & JEWELLRY INSTITUTE also provides advance courses in Gem Identification with advanced Scientific techniques. For this candidate must hold a diploma in Gemology from IGL. This advance Gem Identification course is based on advance techniques which is Used for gem identification with some scientific procedures. Through ACGI we provide exclusive collection of Microphotography for understanding various types of inclusions source wise.
Geological Occurrence with Bibliography, types of Rocks – on the basis of formation, composition Types of deposits with diagrams, method of mining – procedures, places (Geographical co – relation – with map)
The uses of the lens and microscope in gem testing; including microscope adaptations commonly used in gemmology.
Observation of gem materials: internal and external features; immersion of gems to aid observation.
External features; internal features and the study of inclusions, in rough and fashioned natural, artificial, treated and imitation gem materials.
Atomic-scale structure, electrons and chemical bonding.
Crystal structures in terms of chemical bonding.
Crystal structure; reference (crystallographic) axes and crystal symmetry; crystal habits.
Amorphous and metamict materials; polymorphs; isomorphism.
Differential hardness.
Hardness and its use in testing.
Streak test.
Parting.
Accurate specific gravity measurement for gem testing; hydrostatic weighing; precautions in specific gravity testing
The use of high-density liquids in gem testing; care and caution in use.
Optical properties of crystalline materials; uniaxial materials; biaxial materials.
The systematic interaction of light with crystal structures: polarization, optic axes and optic axial interference figures; uses in gem testing.
Refractive index, birefringence and optic sign, their measurement by refractometer and by other methods; uses in gem testing.
Colour; white light; light and electrons.
Colour and its causes in gem materials; luminescence.
Physical optics; optical phenomena that affect light.
The use of colour in gem testing; spectroscope; colour filters, dichroscope
Gem testing techniques employed in gemological laboratories; X-ray, infrared, ultraviolet and advanced techniques
The rock cycle.
Geological processes and terms (general descriptions and outlines only).
Processes and stages in lapidary and diamond manufacture; lapidary and diamond manufacturingg equipment (general descriptions only).
Details of methods of gem treatments eg: heating, glass filling, beryllium or lattice diffusion, dyed, oiling, etc.
Identification of gem treatments.
Disclosure of treatments
A brief outline of methods of production for the common artificial gem materials including: Verneuil flame fusion; Czochralski (crystal pulling); flux melt; hydrothermal; skull melting; high pressure high temperature; gel growth and ceramic methods.
Identification of common artificial gem materials including: cubic zirconia (CZ), synthetic moissanite, glass.
Disclosure of artificial gem materials
The description and methods of identification of gem materials including as applicable:Chemical composition, Crystal system, crystal habit. Common and characteristic crystal forms and crystal face markings and features,Cleavage and fracture.
Hardness. SG. (Specific Gravity)
Colour; causes of colour; pleochroism; absorption spectra; luminescence.
Lustre, Internal reflection effects (including iridescence, chatoyancy and asterism);
RI; birefringence; optical nature and optic sign, Dispersion (description of relative amounts only).
Common and characteristic inclusions.
Major geological occurrences; localities and important commercial deposits.
Separation of gem materials from their synthetics and most common simulants.
Detection of treatment or enhancement.
Management and Marketing Techniques ; Export & Import Formalities, Banking & Taxation.
Laboratory Certification, Trade norms and regulation international controversies and ethics.
All the gemstone which are given above should be identified on the basis of general and some advance techniques.
Management and Marketing Techniques ; Export & Import Formalities, Banking & Taxation.
Laboratory Certification, Trade norms and regulation international controversies and ethics.
