Feature articles from this issue:

• Methods and Challenges of Establishing the Geographic Origin of Diamonds by Evan M. Smith, Karen V. Smit, and Steven B. Shirey 

• Sapphire Beneath the Rich Black Soil of Muling, Northeastern China by Yimiao Liu and Ren Lu

• Gems on Canvas: Pigments Historically Sourced from Gem Materials by Britni LeCroy

• Color Mechanism and Spectroscopic Themal Variation of Pink Spinel Reportedly from Kuh-i-Lal, Tajikistan by Yicen Liu, Lijian Qi, Dietmar Schwarz, and Zhengyu Zhou

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SKU: 4302204