Basel: For several months already a supply of blue cobalt-bearing spinel has been appearing in the gem trade, including some stones of remarkable size –up
Basel: Advanced testing using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LAICPMS) on an anomalous stone from a batch of 10 emeralds submitted to the
Basel: The first detailed study characterising an emerald type from Afghanistan that has recently become available in the gemstone trade has been prepared by a
Basel: The Swiss Gemmological Institute SSEF has successfully age-dated the historic ‘Ana Maria Pearl’ using carbon-14 (14C). This is the first time such a procedure
Basel: The Swiss Gemmological Institute SSEF has become the first gem laboratory worldwide to introduce into its facility the ground-breaking GemTOF instrument, which conducts chemical
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