Geology of Coloured Gemstones
Groat, Lee A., and Brendan M. Laurs. "Gem formation, production, and exploration: Why gem deposits are rare and what is being done to find them." Elements 5.3 (2009): 153-158. Link to Article
Groat, L. A., Giuliani, G., Marshall, D. D., & Turner, D. (2008). Emerald deposits and occurrences: A review. Ore Geology Reviews, 34(1), 87-112. Link to Article
Groat LA (ed) (2007) Geology of Gem Deposits. Mineralogical Association of Canada Short Course 37, 276 pp.
Simonet, C., & Okundi, S. (2003). Prospecting methods for coloured gemstone deposits in Kenya. African Journal of Science and Technology, 4(1). Link to Article
Cook, F. A. (1997). Applications of geophysics in gemstone exploration. Gems and Gemology, 33(1), 4-23. Link to Article