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Sri Lanka | |
| Warin, R. (2019) Minéraux et formes cristallines, notre monde... A.G.A.B. Minibul November 2019, 15-21 (in French). Gübelin, E., Wolgensinger, M. (1976) Edelstenen. Uitgeverij Artis, Brussel (in Dutch). |
| Shigley, J. E., Laurs, B. M., Janse, A. J. A., Elen, S., & Dirlam, D. M. (2010). Gem Localities of the 2000s. Gems & Gemology, 46(3). |
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| Shigley, J. E., Dirlam, D. M., Laurs, B. M., Boehm, E. W., Bosshart, G., & Larson, W. F. (2000). Gem localities of the 1990s. Gems & Gemology, 36(4), 292-335. |
| Shigley, J. E., Dirlam, D. M., Laurs, B. M., Boehm, E. W., Bosshart, G., & Larson, W. F. (2000). Gem localities of the 1990s. Gems & Gemology, 36(4), 292-335. |
| Shigley, J. E., Dirlam, D. M., Laurs, B. M., Boehm, E. W., Bosshart, G., & Larson, W. F. (2000). Gem localities of the 1990s. Gems & Gemology, 36(4), 292-335. Rob Lavinsky |
| Econ Geol (1981) 76:733-738 Joseph A. Freilich. |
Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka