Synthetic Emeralds Grown by Richard Nacken in The Mid-1920s: Properties, Growth Technique, and Historical Account

Schmetzer, K., Gilg, H. A., & Vaupel, E. (2016). SSynthetic Emeralds Grown by Richard Nacken in The Mid-1920s: Properties, Growth Technique, and Historical Account. Gems & Gemology, 52(4). Link to Article