London, UK – January 19, 2015; The Gemmological Association of Great Britain (Gem-A) announced the official introduction of its brand new Coloured Stones Grading Course as launched at their annual ...
The Gemmological Association of Great Britain, or Gem-A, is the world’s longest established provider of gem and jewellery education. The Gemmology Diploma evolved from the first gem course proposed ...
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