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

Over the past several years, the market for pink-coloured rose quartz has been augmented by variants

Gem-quality sapphires containing ‘exotic’ elements such as Sn, Nb, Zr, Ta, W, are of special int

Sixteen rough diamonds were acquired in 2023 by co-author TTS from a gem dealer linked to Mong Hsu,