DIAMONDPLUS

Electronic devices for screening loose diamonds, comprising two solid-state lasers and two miniature spectrometers, that make a laser-excited photoluminescence measurements on stones immersed in liquid nitrogen, and that detect and screen out graphitization in fractures and halos around internal inclusions and high-pressure, high-temperature (HPHT) treated stones, and parts and fittings therefor, all for use in relation to gems and gemology or for use by gemologists, retail or wholesale jewellers, jewellery manufacturers, gemstone traders or polishers, and analytical laboratories for use in respect of gems, gemstones and jewellery