Coloured Gemstone Identification Course

COLOURD GEMSTONE INDENTIFICATION COURSE ( CGIC )

We at INDRAPRSTHA GEM & JEWELLERY INSTITUTE through CGIC covers complete knowledge about the identification of colored gemstone. We help you to identify and separate colored gemstone among in various imitation and synthetic available in the market. We also conduct the study classes to impart theoretical, scientific,technical knowledge and practical experience in the colored gemstone trade .We also train you to identify treatments and enhancements done in the market to enhance the beauty and value of colored gemstones . You shall learn the use and working of Gemological Instruments in the process of Gem Testing,you shall handle hundreds of actual stones like rubies,sapphires, emeralds etc. ( Cut + Rough ) during the learning process and in the end shall identify more than a Thousands Of stones on your own using various Gem instruments.

TOPIC TO BE COVERED UNDERCOURSE

• INTRODUCTION

CG1 - Formation of minerals geological occurrence mining methods, basic qualities (beauty,rarity,durability), classification of gem materials weights and measure, Market terms (India trade)

• PHYSICAL PROPERTIES OF GEMSTONES

CG2- Hardness, Cleavage, Fracture, Parting, Specific Gravity, Heavy Liquids, Estimation of heft of gem materials.

• CRYSTALLOGRAPHY

CG3- , crystal systems, forms, Habit, Twinning, surface markings, Identification of Rough Gemstones.

• MAGNIFICATION

• CG4- Inclusions, types of Inclusion, importance of Inclusion in Gem Identification, source/ origin identification while studying diff Inclusions, Identification of Inclusions by special Audio-visual techniques.

• OPTICAL PROPERTIES

CG5- Nature of light, Electromagnetic spectrum, Transparency, Light Reflection and Refraction, Refractive Index and its measurement, Phenomenal effects, chatoyancy , Asterism, sheen, Aventure scence, Play of color etc. Reflectivity, color and its causes, Pleochroism, Dispersion, Absorption spectroscopy, Luminescence, Application of ultra-violet, x-rays and Infrared rays in Gem Identification.

• INSRUMENTS USED IN GEM IDENTIFICATION

CG6- 10XLENS, MICROSCOPE, POLARISCOPE, DICHROSCOPE, REFRACTOMETER, SPECTROSCOPE visible, short theory on FTIR spectrometer, ultra-voilet light, specific Gravity by Hydrostatic method in liquid Immersion, Chelsea color Filter, Geiger Muller counter, Hotpoint, etc.

• SYNTHETIC COMPOSITE & IMITATION GEMSTONES

CG7- Method of synthesis, stones synthesized,, identification technique, characteristics, manufacturer and trade names.

• GEM ENHANCEMENT METHOD AND THEIR INDENTIFICATION

CG8- Colorless colored impregnation, Heat Treatments, Coating, Irradiation, Diffusion treatment(Surface + Beryllium), Foiling. Laser Drilling.

NOTE- INDETIFICATION OF ENHANCEMENT FROM ADVANCED AUDIO VISUAL TECHNIQUES

• CG9- Description of gem materials (only species are given below) includes various varieties also.
• INORGANIC:
  • A: Andalusite, Apatite, Azurite
  • B: Benitoite Beryl (Aquamarine, Emerald, etc.)
  • C: Chrysoberyl ( Alexandrite, cat’s eyes)
  • D: Danburite Diamond, Diopside, Dioptase, Dumorterite
  • E: Ekanite, Enstantite Epidote
  • F: Feldspare ( Moonstone, labradorites, etc)
  • G: Garent ( Almandine, pyrope, spessartite Grossular. Etc)
  • H: Hematite
  • I: Idocrase, Iolite ( cat’s eye, Bloodshoot, etc)
  • J: Jade ( jadeite/Nephrite)
  • K: Kyanite, Kornerupine
  • L: Lapis Lazuli
  • M: Malachite
  • N: Natural Glass (Obsidian/Moldavite, etc.)
  • O: Opal ( Boulder, Matrix, cat’s eye, potch, Hydrophane etc. )
  • P: Pyrite, Peridot
  • Q: Quartz(crystalline & chalcedony)
  • R: Rhodochrosite, Rhodonite
  • S: Scapolite, sinhalite, sodalite, spinel, sphene(Titanite),spodumene(kunzite/Hiddenite), sapphirine, sillimanite sugilite
  • T: Topaz, Tourmaline, Turquoise, Taaffeite
  • Z: Zoisite(Tanzanite, Thulite), Zircon(high/medium, low)

  ORGANIC : Amber, coral, jet, Pearl (Natural, cultured, Imitation), Ivory, shell, Tortoise shell. The varieties and species occurrence, recovery and various advance methods of identification for the above gem materials.

• CG10

Identification of above mentioned species acc to R.I.. Ranges make it more easier.

• CG11- GEMESTONE CUTS

Basic and simple styles of cut, importance of orientation and evaluation.

• CG12

World wide occurrence of gem materials.