Advancing Fei Cui Origin Authentication: A comparison of green fei cui from Myanmar, Guatemala, Italy and Russia

Performing a literature search is a very important—but often neglected—part of doing gemmologica

One of the challenges facing gemologists today is the detec- tion of low temperature (below 1200°C)

Most of the spinels are found in shades of red to purple. Colourless, green and cobalt bearing varie