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IDEAL FOR: Senior retail professionals or experienced pawnbrokers involved in buying or selling loose coloured gemstones or set jewellery.

This is a hands-on course designed for those who already have knowledge of Coloured Gemstones and will reveal the inside story about gemstone treatments. Under the expert tuition of Gwyn Green, delegates will study a range of sample stones and learn some important lessons about detecting treatments and recognising the tell-tale signs that a stone is not entirely natural and untreated. Provides 6 hours of Continuing Professional Development (CPD) Activity.

Refreshments are available throughout the day; a sandwich lunch is included in the course price.


Why are Gemstones Treated?

Types of treatment and the gems suitable

  • Surface treatments
  • Surface and Sub-surface treatments
  • Treatments throughout
  • Which gems on the market are commonly subject to treatments?

Detection of treatments

  • Appearance before and after treatments
  • Signs that a gem has been treated – what to look for
  • Simple tests to determine whether or not a gem has been treated

Reliability of treatments the down-side of treatments

Disclosure of treatments, CIBJO regulations


  • Examination of treated gems to compare appearance by eye and using magnification with untreated gems
  • Discussion of sophisticated techniques necessary for to detect some treatments.

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