Scope and Contents SEGMENT 1: The $2,000,000 J. P. Morgan Gem Collection. Brian Mason, AMNH curator of physical geology and mineralogy, describes the museum's collection of gems, which consists of diamonds, rubies, sapphires and emeralds. Mason discusses how these gems were cut and polished, using films produced by DeBeers Consolidated Mines Ltd. and E. J. Mauther. The reasons why the stones are so valuable are also examined. SEGMENT 2: Lampreys. Lampreys and their detrimental effect on the fishing industry in...