RAPAPORT... Rapaport Group chairman Martin Rapaport will give a presentation on the loose-diamond and jewelry market at a conference hosted by the Accredited Gemologists Association (AGA).The event will take place in Las Vegas on June 9 prior to the JCK Las Vegas show, AGA said recently. In addition, David Block, the CEO of Sarine Technologies, will give a talk on artificial intelligence (AI) in d...