Synthetic or Man-made Stones Reports
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CGS:Cr4+, a greenish-blue synthetic melilite
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- 22 April 2018
CGS stands for Calcium Gallium Silicate and it belongs to the melilite-type with its formula Ca2Ga2SiO7. This material is synthesized by Czochralski process and doped with chromium as Cr4+. This... -
Purplish-pink synthetic morganite
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- 12 December 2017
During 2017 fall, few stones were facetted from rough of synthetic morganite reportedly originating from Australia. I have not seen the rough in person. The color of the stone is quite saturated and... -
An ancient man-made blue and white glass from Ispahan, Iran
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- 29 August 2016
The piece of blue and white material shown in figure 1 was submitted for analysis. Initially proposed as blue quartz, it also looks like some blue and white sodalite. Such kind of material comes from... -
Uranium glass
- Information
- 06 December 2015
Uranium glass is glass which has had uranium (U), usually in oxide diuranate form, added to a glass mix before melting for coloration. The proportion usually varies from trace levels to about 2% by...