SSEF in Hong Kong: 17 – 23 June 2019

Tag : Opal

News from the SSEF (2018)

Author(s) :

- Date : 2018

Tags : Emerald / Ethiopia / Grandidierite / Opal / Padparadscha / Sapphire

News from the SSEF Lab. 2018 Swiss Gemmological Society conference. Presentation by Dr. Michael Krzemnicki