Journal
Journal
21 May 2026
21 May 2026
The gemstones of the Steinkaulenberg, Idar-Oberstein A mineralogical-gemmological view with special consideration of colour causes and inclusion paragenesis
Abstract The occurrence of agate, jasper, rock crystal, amethyst and smoky quartz of the Steinkaulenberg at the periphery of the gemstone metropolis Idar-Oberstein, which is open...
Journal
9 July 2025
9 July 2025
Gemmology issue 1/2 June 2025
The current issue of Gemmologie - Zeitschrift der Deutschen Gemmologischen Gesellschaft e.V. is available to members in the online archive The magazine is also available as a...
Journal
7 February 2024
7 February 2024
Opal from Honduras
Occurrences of opal in the Central American country Honduras are already known since the mid-19th century. Opals with and without playof-colour are found in volcanic rocks,...
