Comparing the absorption spectra of type IIa and type IIb diamonds greatly helps to better understand why a diamond of type IIb is blue to greyish blue.
by J.-P. Chalain, first published in Facette 22 (F […]
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.
Presentation by Jean-Pierre Chalain at the International Gemmological Conference (IGC) in August 2019.
A Preliminary SIMS Study Using Carbon Isotopes to Separ […]
Presentation by Jean-Pierre Chalain at 2015 Swiss Gemmological Society conference on HPHT treatment detection at SSEF
Contributions de la gemmologie de laboratoire à l’ […]