Karayigit, A. I. (2007). Origin and properties of Oltu gemstone coal. Energy Sources, Part A, 29(14), 1279-1284. Link to Article
Gemstone Deposits in Turkey
Hatipoglu, M., Babalik, H., & Chamberlain, S. (2010). Gemstone Deposits in Turkey. Rocks & Minerals, 85(2), 124-133. Link to Article
Origin of tanzanite and associated gemstone mineralization at Merelani, Tanzania
Harris, C., Hlongwane, W., Gule, N., & Scheepers, R. (2014). Origin of tanzanite and associated gemstone mineralization at Merelani, Tanzania. South African Journal of Geology, 117(1), 15-30. Link to Article
Geology and occurrence of gems in Sri Lanka
Herath, J. W. (1984). Geology and occurrence of gems in Sri Lanka. The Journal of the National Science Council of Sri Lanka, 12(2), 257-271. Link to Article
Sri Lanka: Expedition to the Island of Jewels
Lucas, A., Sammoon, A., Jayarajah, A. P., Hsu, T., & Padua, P. (2014). Sri Lanka: Expedition to the Island of Jewels. Gems & Gemology, 50(3). Link to Article
Prospecting methods for coloured gemstone deposits in Kenya
Simonet, C., & Okundi, S. (2003). Prospecting methods for coloured gemstone deposits in Kenya. African Journal of Science and Technology, 4(1). Link to Article
General setting of coloured gemstone deposits in the Mozambique Belt of Kenya—preliminary considerations
Simonet, C., Okundi, S., & Masai, P. (2000, November). General setting of coloured gemstone deposits in the Mozambique Belt of Kenya—preliminary considerations. InProc. 9th Conf. Geol. Soc. Kenya, Nairobi (pp. 123-138). Link to Article
Japanese Jadeite:
Abduriyim, A., Saruwatari, K., & Katsurada, Y. (2017). JAPANESE JADEITE: HISTORY, CHARACTERISTICS, AND COMPARISON WITH OTHER SOURCES. Gems & Gemology, 53(1). Link to Article
Sapphires from northern Ethiopia
Vertriest, W., Weeramonkhonlert, V., Raynaud, V., & Bruce-Lockhart, S. (2017). Sapphires from northern Ethiopia. Link to Article
Rhodochrosite from Brazil
Zwaan, J.C. (2015). Rhodochrosite from Brazil .The Journal of Gemmology, 2015, Vol.34(6), p.473(3). Link to Article
The gemstone deposits of Brazil: occurrences, production and economic impact.
De Brito Barreto, S., & Bittar, S. M. B. (2010). The gemstone deposits of Brazil: occurrences, production and economic impact. Boletín de la Sociedad Geológica Mexicana, 62(1). Link to Report