The PDF version of this issue is available at no charge. Visit www.gia.edu Gem Wealth of TanzaniaDona M. Dirlam, Elise B. Misiorowski, Rosemary Tozer, Karen B. Stark, and Allen M. Bassett Gamma-Ray Spectroscopy to Measure Radioactivity in GemstonesCharles E. Ashbaugh III Dyed Natural Corundum as a Ruby ImitationK. Schmetzer, H.A. Hanni, E.P. Jegge, and F.-J. Schupp An Update on Sumitomo Gem-Quality Synthetic DiamondsJames E. Shigley, Emmanuel Fritsch, Ilene Reinitz, and Mike Moon Every issue also includes the most up-to-date reports from the GIA Laboratory (Lab Notes) and gemologists around the world (Gem News International).GIA students and alumni save 10% on back issues! Enter coupon code GGALUM at checkout. Usually ships in 3-5 business days. SKU: 439203
