Blog der Deutschen Gemmologischen Gesellschaft

dgemg logo

 

Herausgeber: 
Deutsche Gemmologische Gesellschaft e.V.
Prof.-Schlossmacher-Str. 1
D-55743 Idar-Oberstein

 

Copyright:
Für alle Beiträge behält sich die Deutsche Gemmologische Gesellschaft (Deutsche Gesellschaft für Edelsteinkunde) e.V. sämtliche Rechte vor, insbesondere die des Nachdrucks, der Übersetzung in andere Sprachen und der photomechanischen Wiedergabe. Die veröffentlichten Beiträge stellen – soweit namentlich bezeichnet – die Auffassung der Autoren dar und geben nicht notwendig die Meinung von Herausgeber und Schriftleitung wieder. (Content of this journal may not be reproduced in any form without the permission of the German Gemmological Association. Opinions expressed do not necessarily reflect the views of the Association.)

Gemmology


Stabilised Aquamarine Cabochon with Unusual Colouring

Recently, the authors examined a 17.20 et greenish blue oval cabochon that exhibited a noticeably blurry, uneven colour distribution (Figure 18). lt had a spot RI of 1.57, as...

Yellow sapphire with unstable colour centre

Fig. 1: Yellow sapphire of 4.57 ct with a unstable colour. (A) shows the stone as it was submitted for examination, (B) after a fading test under a strong lamp for 15 min, (C)...

Violet-pink coloured garnet with blue apatite inclusions

Purple-pink coloured garnets with blue apatite inclusions have been on the market for some time and are becoming increasingly popular. The garnets come from a location in...

We use cookies on our website. Some of them are essential for the operation of the site, while others help us to improve this site and the user experience (tracking cookies). You can decide for yourself whether you want to allow cookies or not. Please note that if you reject them, you may not be able to use all the functionalities of the site.