Jewelry makers exported $83 million worth of merchandise in the first quarter, 0.5 percent more than the same period of 2005, the Israel Export Institute said Monday. A 13% drop in gold jewelry exports to $38.6m. was compensated by a 5% rise in exports of gold studded jewelry to $28.7m.; a 24% rise in costume jewelry to $8.7m.; and an 84% rise in silver jewelry to $6.8m. Sales of silver and costume jewelry are on the rise worldwide since makers have succeeded in create niche markets, the institute noted. On June 3, nearly 30 Israeli jewelry makers will exhibit their wares at a show in Las Vegas.