Sapphires Heated with Pressure – A Research Update. Published in InColor, Spring 2019, 86-90.
Sapphires from New Zealand. Published in 2006.
Author(s): L. Kiefert, M.S. Krzemnicki, G. Du Toit, R. Befi, K. Schmetzer
X-ray luminescence, a valuable test in pearl identification. Published in Journal of Gemmology, 2005.
Author(s): H.A. Haenni, L. Kiefert, P. Giese
Asterism in beryl, aquamarine and emerald- an update. Published in Journal of Gemmology, 2004.
Author(s): K. Schmetzer, L. Kiefert, H.A. Haenni
Ein neues Instrument für die analytische Gemmologie: LIBS
Author(s): H.A. Haenni, M.S. Krzemnicki, L. Kiefert, J.-P. Chalain
Synthetic Verneuil corundum with unusual color zoning. Published in Gems & Gemology, 2004.
Author(s): L. Kiefert
Verschiedenfarbige Bernsteine aus dem Baltikum. Published in 2003.
Author(s): L. Kiefert
“Rainbow calsilica”. Published in GAHK Journal, 2003.
Author(s): L. Kiefert
Der Stein des Regenbogens: “Rainbow Calsilica”. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft by Kiefert et al. in 2003.
Author(s): L. Kiefert
Nulla parte mirabilior: Zur Verwendung von Edelsteinen in der Antike. Published in 2003.
Author(s): S. Haeberli, L. Kiefert