Retrospective views on the identification of the HPHT treatment. Presentation by Jean-Pierre Chalain at 2015 Gem-A conference in London (UK)
Presentation by Jean-Pierre Chalain at 2015 Swiss Gemmological Society conference on HPHT treatment detection at SSEF
Presentation at 2009 European Gemmological Symposium (Bern, Switzerland) by Jean-Pierre Chalain on the platelet peak of HPHT-treated diamonds of type Ia.
Recognizing GE POL diamonds at SSEF. Published in 2000.
Author(s): H.A. Haenni
New spectral evidence for GE POL diamond detection. Published in Gems & Gemology, 2000.
Author(s): H.A. Haenni, J.-P. Chalain, E. Fritsch
Identification of GE POL diamonds: a second step. Published in Journal of Gemmology, 2000.
Author(s): J.-P. Chalain, E. Fritsch, H.A. Haenni
Identification of colourless HPHT treated diamonds (e.g. GE POL). Published in 2000.
Author(s): J.-P. Chalain, E. Fritsch, H.A. Haenni