Electronic instruments, namely, electronic instruments comprising a self-contained screening device designed to allow parcels of polished diamonds to be quickly analyzed in real time to determine if they contain potential high pressure, high temperature (HPHT) synthetics based on their specific luminescent response to ultraviolet (UV) light; all the aforementioned items for use in relation to gems and gemology or for use by gemologies, retail or wholesale jewellers, jewellery manufacturers, g...