Sapphires Heated with Pressure – A Research Update. Published in InColor, Spring 2019, 86-90.
Presentation on developments in treatments of ruby, sapphire and corundum. Focus on characteristics, detection and declaration. Talk given at 2013 Swiss Gemmological Society conference by Dr. Michael Krzemnicki.
Analysis of rubies with corroded surfaces. Journal of Gemmological Association of Hong Kong (2011)
Author(s): M.S. Krzemnicki
Diamant-Typen: Identifikation und Bestimmung von Behandlungen. Gold’Or (2011)
Author(s): J.-P. Chalain
Update on “chocolate” Tahitian cultured pearls. Published in Gems & Gemology, 2006.
Author(s): H.A. Haenni
News about treated brown cultured pearls. Published in GAHK Journal, 2006.
Author(s): H.A. Haenni
Are new sapphires from Sri Lanka diffusion-treated or not? Published in Jewellery News Asia, 2004.
Author(s): H.A. Haenni
À la poursuite du diamant noir – On the trail of the black diamond. Published in 2001.
Fracture filling in emeralds and its detection with laboratory methods. Published in ICA Gazette, 1998.
Author(s): H.A. Haenni
How to identify fillings in emeralds using Raman spectroscopy. Published in Jewellery News Asia, 1996.
Author(s): H.A. Haenni, L. Kiefert, J.-P. Chalain