A Case Study of Ivory Species Identification: Using a Combination of Morphological, Gemmological and Genetic Methods. Published in Journal of Gemmology, 2020, 37 (3), 282-297.
Fake pearls made from Tridacna gigas shells. Published in Journal of Gemmology, 2017, 35, 5, 424-429.
Author(s): M.S. Krzemnicki, L.E. Cartier
Diamond testers with a limited performance. Published in Journal of Gemmological Association of Hong Kong GAHK, 2017, 38, 37-39.
Author(s): H.A. Haenni
Modern Doublets from Germany and India. Published in Journal of Gemmology, 2015, 34, 6, 479-481.
Author(s): H.A. Haenni, U. Henn
Some uncommon sapphire “imitations”: Blue Co-zirconia, kyanite and blue dumortierite. Published in Journal of the Gemmological Association of Hong Kong GAHK, 34, 62-64
Author(s): M.S. Krzemnicki
Update on Moissanite identification. Published in GAHK Journal, 2000.
Author(s): J.-P. Chalain
Zircon ou zirconia à ne pas confondre. Published in Journal Suisse d’horlogerie et de bijouterie, 1989.
Author(s): H.A. Haenni
Zirconia is not zircon. Published in Swiss watch and jewelry journal, 1989.
Author(s): H.A. Haenni