Additional photos to accompany the article:

Bui T.N., Deliousi K., Malik T.K. and De Corte K., 2015. From exsolution to ‘gold sheen’: A new variety of corundum. Journal of Gemmology, 34(8), 678–691, http://dx.doi.org/10.15506/JoG.2015.34.8.678 

JoG2015_34_8 Depository Bui

Franz L., Tay Thye Sun, Wirth R., de Capitani C. and Loke Hui Ying, 2016. Violet-to-blue ‘Nuummite’ from Simiuttat, Greenland: Origin of iridescence and conditions of formation. Journal of Gemmology, 35(4), 330–339, http://dx.doi.org/10.15506/JoG.2016.35.4.330.

• Electron microprobe (EPMA) analyses of orthoamphibole and analytical electron microprobe (AEM) analyses of orthoamphibole lamellae in violet-to-blue ‘Nuummite’ from Greenland orthoamphibole and analytical electron microprobe (AEM) analyses of orthoamphibole lamellae in violet-to-blue ‘Nuummite’ from Greenland
• Equilibrium phase diagram
• Mineral reactions for violet-to-blue ‘Nuummite’ from Greenland

Additional plots to accompany Figure 8 of the article:

Wang H.A.O., Krzemnicki M.S., Chalain J.P., Lefèvre P., Zhou W. and Cartier L.E., 2016. Simultaneous high sensitivity trace-element and isotopic analysis of gemstones using laser ablation inductively coupled plasma time-of-flight mass spectrometry. Journal of Gemmology, 35(3), 212–223, http://dx.doi.org/10.15506/JoG.2016.35.3.212.

JoG2016_35_3 Depository Wang

Additional examples of EDXRF spectra, to accompany the article:

Herzog F.A., 2015. The potential of a portable EDXRF spectrometer for gemmology. Journal of Gemmology, 34(5), 404–418, http://dx.doi.org/10.15506/jog.2015.34.5.404

JoG2014_34_5 Depository Herzog