Karampelas, S., Fritsch, E., Zorba, T., Paraskevopoulos, K.M. and Sklavounos, S. 2007. AN UPDATE IN THE SEPARATION OF NATURAL FROM SYNTHETIC AMETHYSTS. Bulletin of the Geological Society of Greece. 40, 2 (Jan. 2007), 805–815. DOI:https://doi.org/10.12681/bgsg.16721.