Exceptional gems like paraiba are in demand, but so are more affordable stonesExpectations are positive heading into the 2014 Tucson gem shows. During 2013, the industry saw more investment in gemstone exploration and mining than during the previous year. Dealers report that interest in exotic gems, especially paraiba tourmaline and padparadscha sapphire, spiked sharply during the second half of 2013. Prices have been increasing in response. Demand from the designer market is driving this trend.The trade’s more sophisticated buyers are seeking exotic gems for their rarity. Many have observed the sharp increase in value reported for fine natural ruby and sapphire and expect the pattern to repeat in other exceptionally rare varieties. Reports say there is virtually no more production of fine paraiba-type tourmaline in Mozambique anymore and, as a result, prices have been steadily increas