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OUR TRAININGS

COLOURED GEMSTONES

PUBLIC

Anyone interested in coloured stones

OBJECTIVES

  • To understand gemstones such as rubies, sapphires and emeralds, from their formation to their use in Jewellery, and their valuation criteria on the marketplace
  • To be able to differentiate these gemstones from other coloured gems.
  • To understand synthesis processes and be able to identify them

TEACHING METHODS AND RESOURCES

  • Training provided by a professional gemmologist
  • Use of gemmological equipment: loupe, polariscope, dichroscope, refractometer
  • Observation of a large number of samples

LEARNING ASSESSMENT METHOD

  • Knowledge assessment
  • Certificate issued at the end of training

PROGRAMME

DAY 1

Corundum: chemical, physical and optical properties

  • Rubies: history and properties
  • Sapphires: history and properties

Corundum formation:

  • Igneous rocks : definition
  • Metamorphic rocks : definition, types of metamorphism

Geology of corundum: deposits in Central and Southeast Asia

  • Types of deposits where corundum is found : marble, basalts, amphiboles
  • Geographical origins and inclusions : Myanmar, Thailand, Cambodia, Sri-Lanka, Vietnam, Himalayas, India (Kashmir), Afghanistan
DAY 2

Geology of corundum: other deposits

  • Deposits in Africa (Kenya, Tanzania, Mozambique, Madagascar), in Australia and in the USA
  • Types of deposits and common inclusions
  • Corundum evaluation criteria : colour, geographical origin, weight, cut, transparency and clarity
  • The corundum market

 

DAY 3

Corundum synthesis processes and treatments: definition and identification methods

  • Definition and analysis of synthesis processes: Verneuil, Czochralski, Anhydrous and Hydrothermal processes
  • Treatments: definition and analysis of various treatments
DAY 4

Emerald

  • Chemical, physical and optical properties of the emerald and its geological formation
  • Geology : historical deposits, geographical origins and inclusions
  • Evaluation criteria : colour, transparency et geographical origin
  • Production : global marketplace and cutting centres
DAY 5

Emerald synthesis processes and treatments: definition and identification methods

  • Synthesis processes: anhydrous dissolution process, hydrothermal overgrowth process. How to recognise them
  • Treatments: definition and analysis of various treatments
Inquiries and subscription

Maéva Peltier : m.peltier@lfg.paris – 01 40 26 98 00

CONTACT US :

contact@lfg.paris
(+33) 01 40 26 25 45
30, rue de la Victoire - 75009 Paris
Monday - Thusday : 9H30 to 17H00
Friday : 9h30 to 16h30
Withdrawal files at same days and time

   

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