IGL

Advance Course in GEM Identification

ADVANCE COURSES IN GEM IDENTIFICATION ( ACGI )

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.

TOPIC TO BE COVERED:

  • AD.1 Geological Occurrence (All in brief)
  • 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)

    • AD2. Observation and Magnification

    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.

    • AD3.Materials and Structure

    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.

    • AD4. Durability

    Differential hardness.

    Hardness and its use in testing.

    Streak test.

    Parting.

    • AD5. Weight, Density and Specific Gravity

    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.

    • AD6. Light and Optics

    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.

    • AD7. Colour

    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

    • AD8. Other Gem Properties

    Gem testing techniques employed in gemological laboratories; X-ray, infrared, ultraviolet and advanced techniques

    • AD9. The Geology of Gems

    The rock cycle.

    Geological processes and terms (general descriptions and outlines only).

    • AD10. The Gemstone Pipeline
    • AD11. Fashioning Gemstones

    Processes and stages in lapidary and diamond manufacture; lapidary and diamond manufacturingg equipment (general descriptions only).

    • AD12. Treatments

    Details of methods of gem treatments eg: heating, glass filling, beryllium or lattice diffusion, dyed, oiling, etc.

    Identification of gem treatments.

    Disclosure of treatments

    • AD14. Imitations, Simulants and Synthetics

    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

    • AD15. The Gemstones

    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.

    Detail Study On Following Gem Species:

    • Amber
    • Andalusite
    • Apatite
    • Beryl
    • Calcite
    • Chrysoberyl
    • Coral
    • Corundum
    • Diamond
    • Diopside
    • Feldspar
    • Fluorite
    • Garnet
    • Glass (natural)
    • Gypsum
    • Hematite
    • Iolite
    • Ivory
    • Jadeite
    • Jet
    • Kyanite
    • Lapis lazuli
    • Nephrite
    • Malachite
    • Opal
    • Peridot
    • Pearls
    • Prehnite
    • Pyrite
    • Rhodochrosite
    • Rhodonite
    • Quar tz
    • Scapolite
    • Serpentine
    • Shell
    • Sinhalite
    • Sodalite
    • Sphene
    • Spinel
    • Spodumene
    • Topaz
    • Tortoise shell
    • Tourmaline
    • Turquosie
    • Zircon
    • Zoisite (Tanzanite)
    • ADMINISTRATIVE TRAINING

    Management and Marketing Techniques ; Export & Import Formalities, Banking & Taxation.

    • INTERNATIONAL CERTIFICATION STANDARDS

    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.

    Administrative TRAINING

    Management and Marketing Techniques ; Export & Import Formalities, Banking & Taxation.

     

    International Certification Standards

    Laboratory Certification, Trade norms and regulation international controversies and ethics.


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