LAS VEGAS–(BUSINESS WIRE)–Martin Rapaport, Chairman of the Rapaport Group, will speak at the Diamond Dealers Club on March 20 at 2:30 p.m. EDT. Martin will discuss systematic fraud by sellers of synthetic, man-made diamonds who fail to disclose the truth about collapsing synthetic diamond prices. B2B wholesale prices for synthetics have plummeted to about 98% below the Rapaport natural diamond price list, yet sellers continue to compare synthetic and natural diamond prices without disclosing My Business Wire News