1346 Saratoga DrSan Mateo, CA 94403 (650) 574-3247 Celebrating our 50th anniversary in 2017, the International Gem & Jewelry Show (InterGem, Inc.) is proud to boast that we are America’s longest running direct-to-consumer jewelry show. With over 60 shows in more than 35 major U.S. cities, InterGem is also the largest exhibition of gems, minerals […]