End of 2023, three spectacular chalcedony freeform tumbled stones were seen in Paris Mineral & Gems fairs. The color is similar to that of the blue chalcedony found in Turquey and Iran as well as...
Initially published as a Gem note in the Journal Of Gemmology of the Gem-A. 2020, 37(4), 344–346. http://doi.org/10.15506/JoG.2020.37.4.344 Celestine (or celestite, coelestite) is named after the...
Initially published as a Gem note in the Journal Of Gemmology of the Gem-A. 2022, 38(1), 9–11. http://doi.org/10.15506/JoG.2022.38.1.9 Crocoite (PbCrO4) was first found in Russia in 1763, later in a...
The material described in this report has been widely available in online stores. It has been sold for a while as white marble with red cinnabar inclusions from Mexico. The piece showed in figure 1...
Many fluorite prisms have been available for years. These are natural fluorite material shaped and polished like a hexagonal prism terminated by a pyramid and by either a second pyramide or a basal...
The ornamental egg and sphere shown in figure 1 were bought from China as 'Glowing in the dark egg and sphere'. Without knowing what they really are, they make an interesting case to study,...
Initially published as a Gem note in the Journal Of Gemmology of the Gem-A. 2020, 37(1), 7–9. http://doi.org/10.15506/JoG.2020.37.1.7 During the December 2019 Paris International Mineral & Gem...
Initially published as a Gem note in the Journal Of Gemmology of the Gem-A. 2019, 36(8), 688–690. http://doi.org/10.15506/JoG.2019.36.8.688 Enstatite may display asterism with four, six or eight...
Zoisite is very famous in jewellery because of its violet-blue variety named tanzanite after its country of discovery, Tanzania. Zoisite is the orthorhombic polymorph of clinozoisite, a member of...
Recently, a kind of gray 'sunstone' entered the market, it is offered either as a sunstone, an aventurescent feldspar or the most frequently as an aventurescent quartz included of graphite. The...