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From time to time, we get a flashback in gemmological history. This is specifically the case when we receive an antique ring with an ‘early’ Verneuil synthetic ruby showing strongly curved growth bands, or, as in the past few months, when clients submit us doublets....

Copper-bearing tourmaline from Nigeria is known in the trade since about two decades (Milisenda 2001, Henricus, 2001; Smith et al., 2001; Zang et al., 2001). The first reported material from Nigeria was rather of aquamarine- to amethyst-like colours, but shortly after it was followed by...

The body colour of pearls is normally related to the presence of natural colour pigments produced by the mollusc during pearl formation. Another option is to colour pearls artificially, with dyeing being the most readily available method. Often applied to rather low-quality freshwater cultured pearls,...

by Dr. M.S. Krzemnicki, first published in Facette 27 (June 2021)Figure 1 (left): Dyed corundum from Burma (Myanmar), mimicking a beautiful pinkish red ruby. Photo: J. Xaysongkham, SSEF. Figure 2 (center and right): Fissures filled with red oil in this treated (dyed) corundum. Photos: M.S. Krzemnicki,...

by Dr. M.S. Krzemnicki, first published in Facette 27 (June 2021)The two Canary tourmalines (5.2 ct and 19 ct) which were recently analysed at SSEF. Composite photo: Wikimedia commons & SSEF.Tourmaline is a mineral group of complex boro-silicates and is well known to produce gemstones in...