Letšeng stone said to represent "robust demand" for valuable diamonds.
Institute reduces per-stone fee for synthetic and natural testing.
Structural overhaul follows recent closure of New York office.
Registration for 2015 to 2018 Sightholder period to open on August 25.
US diamond jeweller adjusts pricing on jewellery as sales drop 1.3%.
Team went on fact-finding trip to emerald and tourmaline mining areas.
Free seminar to discuss gem identification challenges across Japan.
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Emerging designers can now apply for year-long mentoring scheme.
Gemvision CAD software helps with pricing, ordering and design.
Brand's logo to appear on Lotus E22 car during Austin Grand Prix.
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