Research blog

News

by Dr. M.S. Krzemnicki, first published in Facette 26 (May 2020)Figure 1: Roman sapphire intaglio engraved with the mythical creature hippocamp. Photo: V. Lanzafame, SSEF.In 2019, the Swiss Gemmological Institute SSEF in collaboration with the Istituto Gemmologico Nazionale IGN Rome (Italy)...

Figure 1: Cultured pearl necklace containing one natural pearl. Photo: V. Lanzafame, SSEF.Testing pearl necklaces can be rather painstaking work, as at least two gemmologists at SSEF meticulously and individually check a necklace pearl by pearl, with the aim of finding one (or...

by Dr. M.S. Krzemnicki, first published in Facette 26 (May 2020)Figure 1: Sciacca coral item from which beads were selected for age dating. Also in this picture are two pieces of raw corallium rubrum. Photo: M. Bichsel, SSEF.Since 2017, the Swiss Gemmological...

by Dr. L. Speich, first published in Facette 26 (May 2020)Figure 1: Distribution of nitrogen in an elongated diamond from the Mir mine (Siberia) resembling growth rings in a tree. Analysis shows that this diamond has experienced temperatures between 1175 and 1125˚C. Length...

Based on real case studies on sapphire and emerald specimens, we here present how a simultaneous multi-element approach assists origin determination. Instead of pre-defining a list of isotopes in advance, routine analysis of blue sapphires using LA-ICP-TOF-MS detects rarely occurring trace elements such as beryllium...

Figure 1: A sample of rough deep purple Vesuvianite (4 cm) from northern Pakistan and cabochon of 10.73 ct. Photo: H.A. Hänniby Prof. H.A. Hänni, first published in Facette 26 (May 2020)stan has a number of gemstone deposits that are related to the collision of the Indian continent...

In early 2019, an Australian client submitted a small series of gem- quality light green emeralds ranging from 2.01 – 5.80 ct in weight, which reportedly originated from the same rough crystal from the Riverina deposit in Western Australia (Figure 1). Known since the late...