Canary tourmaline from Zambia
by Dr. M.S. Krzemnicki, first published in Facette 27 (June 2021) Tourmaline is a mineral group of complex boro-silicates and is well known to produce gemstones in a wide range of beautiful colours. A specifically attractive variety is vivid yellow elbaite tourmaline, which owes its colour to manganes
Cu-containing Thin Sheet Inclusion in Cu-bearing Tourmaline from Brazil
Cu-containing Thin Sheet Inclusion in Cu-bearing Tourmaline from Brazil. IGC 2021 Proceedings, 45-46.
Paraiba Research Update: An elemental Analysis of Paraiba Tourmaline from Brazil
At the SSEF, origin determination of Paraiba tourmalines is based on years of experience researching collection samples from SSEF and Prof. Hänni collections, donated and loaned samples from clients, as well as knowledge from scientific literature. However, the mining area and depth of the material have been i
Paraiba Tourmaline Intergrown with Lepidolite Mica
by Dr. M.S. Krzemnicki, first published in Facette 20 (January 2013) The Swiss Gemmological Institute SSEF recently received a necklace for testing that consisted of thirty-three slightly polished light blue to greenish-blue and purple beads. It had originally been sold as Paraiba tourmaline to our client. The
Multi-Element Correlation Analysis of Cu-bearing Tourmaline using LA-ICP-Time-Of-Flight-MS
Multi-Element Correlation Analysis of Cu-bearing Tourmaline using LA-ICP-Time-Of-Flight-MS. EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-16170, https://doi.org/10.5194/egusphere-egu21-16170, 2021.
Fissure-filling in Paraiba Tourmaline
As with any gemstone with fissures, it is of no surprise that some Brazilian Paraiba Tourmaline is filled with a colourless foreign substance (mostly artificial resin) to modify and enhance its transparency and thus apparent beauty.
Field Trip to Paraiba Tourmaline Mines in Brazil
In October 2017, a team of gemmologists from the SSEF had the privilege to visit some Paraiba tourmaline mines in Brazil to get impressions about mining procedures, sorting, cutting and trading activity in the states of Paraiba and Rio Grande do Norte.
SSEF Fieldtrip to Paraiba, Brazil (2018)
Presentation given by Alexander Klumb at 2018 Swiss Gemmological Society conference on an SSEF fieldtrip to the Paraiba region of Brazil.
Paraiba tourmaline intergrown with lepidolite mica
Paraiba tourmaline intergrown with lepidolite mica. Published in Journal of the Gemmological Association of Hong Kong GAHK, 33, 56-58. Author(s): M.S. Krzemnicki
Vanadium-bearing gem-quality tourmalines from Madagascar
Vanadium-bearing gem-quality tourmalines from Madagascar. Published in Journal of Gemmology, 2007. Author(s): K. Schmetzer, H.-J. Bernhardt, C. Dunaigre, H.A. Haenni