Emeralds from the Ural Mountains, USSR
Emeralds are again being mined in the historic district of the Ural Mountains. Physical, chemical, spectroscopic and microscopic characteristics of stones from the recent production are presented and compared with data on older samples as well as those reported in the literature.
The Chromium Content of Lechleitner Synthetic Emerald Overgrowth
The higher the chromium content in synthetic emerald overgrowth, the darker the coating and appearance of the stone will be.