Journal
Journal
26 June 2026
26 June 2026
Gemmological examination of the ruby in the ring of Katharina von Bora (“Lutherring”)
Abstract The present study is focused on the gemmological examination of the centre stone set in the wedding ring attributed to Katharina von Bora, wife of the German theologian...
Journal
10 June 2026
10 June 2026
Material Analysis for the Origin Determination of Chinese Soap Stone Figures
Abstract Seal stones are highly valued gemological materials and their use is still an important part of the Chinese Jade culture. During the 17th and 18th centuries, stonework...
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,...
