Wednesday, February 6, 9:00-10:00 a.m.
           Pearl  Testing: How to distinguish cultured pearls from each other MOHAVE ROOM
              Elizabeth Strack, Gemmologisches Institut Hamburg
              Intermediate-Advanced. It  is more and  more difficult to distinguish the different types of cultured  pearls  from each other. The naked eye is no longer enough. In this seminar   you’ll learn about the main x-ray methodologies to recognize natural  pearls,  but the seminar concentrates on a systematic overview of the  methods (x-ray  identification and others) that can be applied to  distinguish Akoya cultured  pearls and South Sea cultured pearls from  Chinese  freshwater pearls. A systematic approach to pearl testing is  possible because  of the basic differences in growth processes of all  those cultured pearls  available on the market. The approach includes  the distinction of Japanese from  Chinese freshwater cultured pearls and  cultured pearls from Mexico and other niche producers such as the Fiji   Islands and the Red   Sea.