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2022

Gemmological study of the medieval Königsfelder diptychon

In 1298 AD, the king of Hungary Andreas II presented to his wife Queen Agnes a stone-set wooden altar piece as a royal wedding present. This small medieval artwork, known today as the Königsfelder diptychon, was originally made in Venice.

Research Blog
GemmologyMethodsOther Gemstones
2022

Gemtof successfully passed G-Chron 2019 proficiency test on zircon U-Pb dating

The quality and consistency of analytical data is important for gem labs in order to provide replicable results to gemmologists over a long period of time. In addition, the accuracy compared to internationally recognised standards allows us to perform inter-lab comparisons or track instrument performance and tr

Research Blog
GeochemistryMethods
2022

A new led daylight source for diamond colour grading

In 2020, a novel light source for the colour grading of diamonds was developed in a collaboration between SSEF and the Department of Physics, University of Basel (see Figure 1). In contrast to many of the models on the market, the new light source uses state-of-the-art LED (Light Emitting Diode) lights instead

Research Blog
DiamondGemmologyMethods
2021

Zircon inclusions in unheated pink sapphires from Ilakaka, Madagascar: A Raman spectroscopic study

Zircon inclusions in unheated pink sapphires from Ilaka […]

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Authors

  • H.A.O. Wang
  • M.S. Krzemnicki
  • P. Lefevre
  • W. Zhou
Research Articles
GemmologyMethodsSapphireTreatments
2021

New statistical methods for analysis of gemstones

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 bery

Research Blog
GemmologyGeochemistryMethods
2021

SSEF introduces machine learning algorithm for data visualization

by Dr. H.A.O. Wang, first published in Facette 21 (June […]

Authors

  • H.A.O. Wang
Research Blog
GemmologyMethods
2021

Sub-surface laser inscription and marking of gemstones

by Dr. L.E. Cartier, first published in Facette 26 (May […]

Research Blog
MethodsTraceability
2020

ASDI (Automated Spectral Diamond Inspection)

by J.-P. Chalain, first published in Facette 21 (F […]

Research Blog
DiamondMethodsSynthetics
2020

X-Ray Computed Microtomography at SSEF

by Dr. F. Herzog & M.S. Krzemnicki, first published […]

Research Blog
MethodsPearl
2020

The Detection of HPHT-treatment of Diamonds at SSEF: 20 Years later

In 2000, SSEF announced that it was able to identify the HPHT treatment of type II diamonds. About 20 years later, this article summarizes how we were able to achieve this breakthrough and which people from the trade and other research institutions were involved in this important step.

Research Blog
DiamondMethods

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Tags

Age Dating Diamond DNA Emerald Gemmology Geochemistry Jade Methods Organics Origins Other Gemstones Pearl Ruby Sapphire Spinel Synthetics Tourmaline Traceability Treatments

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