Gemology Course (DGIC+CGIC)

Module I

Diamond Grading & Identification Course (DGIC) 2 Months

• Characteristics

• Formation

• Sources

• Minning

• Cutting & polishing Centres

• Trading Centres

• Crystal System

• Physical Characteristics

• Optical Properties

• Clarity

  Blemishes & Inclusions

  Plotting & Identification

          International Standard of Grading

• Carat

  Devices/ Tools

  Estimation of Weight

  Concept of Sieves

• Colour

  International Standard of Grading
  Master stones & Procedure

• Cut

  Table %, Crown Angle

  Girdle Thickness, pavilion Depth

  Crown Height, Total Depth

  Culet Size

Polish & Symmetry

Excellent/Very Good/Good/Fair/Poor Standards

• Fluorescence

• Fancy Colour

• Fancy Shapes

• Pricing/ Valuation

• Identification of Synthetics & Simulants

• Synthetic Moissanite

• Synthetic Diamond

• Treatments

• Market terms/ Indian Trade

• Diamond Sorting

• Rejection & selection

• Series Making

Module I I

Coloured Gemstones Identification Course (CGIC) 4 Months

• Gemology

• Minerals

• Categories of Gemstones

• General Observations

  Colour, Transparency

  Cutting Style, Phenomena

  Luster, Dispersion, Heft

  Assembled Stones

• Physical characteristics

• Crystallography

• Light Theory/ Polarization

• Inclusions- Characteristic/ Diagnostic

• Equipments

• Group/Specie/Variety

• Gemstone Study

• Practical Study of Minimum 850 Stones

• Identification of Mines/ Sources

• Identification of Synthetics

  Flame Fusion/Verneuil Process

  Pulled / Czochralski,

  Skull Melt

  Flux

  Hydrothermal / Bomb

  Stones Synthesized

  Characteristics/Manufacturers

          Identification techniques

• Gem Enhancement Techniques

  Heat, Radiation, Chemical Diffusion

  Fracture Filling, Bleach, Surface Modification

  Surface Impregnation, Laser Drilling

• Fluorescence

• Pricing/ Valuation

• Treatments

• Market Terms/ Indian Trade