
Colour varieties of gems: where to set the boundary
Author(s) : -
Date : 2020
Colour varieties of gems: where to set the boundary? Published in InColor, 2020 Winter, 45, 92-95.
Colour varieties of gems: where to set the boundary? Published in InColor, 2020 Winter, 45, 92-95.
Presentation by Jean-Pierre Chalain at the International Gemmological Conference (IGC) in August 2019.
Blue-green emerald from Nigeria (a consideration of terminology). Published in Australian Gemmologist, 1992.
Author(s): H.A. Haenni