The PDF version of this issue is available at no charge. Visit www.gia.eduQuantitative Colorimetric AnalysisZiyin Sun, Aaron C. Palke, and Nathan RenfroThe Origin of Montanaís Alluvial SapphiresJ.C. (Hanco) Zwaan, Eric Buter, Regina Mertz-Kraus, and Robert E. KaneThe Grand Sapphire of Louis XIV and the Ruspoli SapphireFranaois Farges, Gerard Panczer, Nassima Benbalagh, and Geoffray RiondetCharacterization of Tarnish Spots in Chinese High-Purity Gold JewelryTaijin Lu, Jian Zhang, Yan Lan, Ying Ma, Hua Chen, Jie Ke, Zhenglong Wu, and Miaomiao Tang Splendor in the Outback: A Visit to Australia's Opal FieldsTao Hsu, Andrew Lucas, and Vincent PardieuEvery 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: 4301501
