Spinel: a gemstone on the rise
Author(s) : -
Date : 2010
Talk given by Dr. Michael Krzemnicki in Hong Kong in 2010 about spinel, a gemstone increasingly in vogue. History, sources, origin determations, synthetics and treatments.
Research Library
Heating and diffusion processes on rubies: characteristics, detection and declaration
Author(s) : -
Date : 2010
Talk on ruby treatments and terminology during CIBJO Ruby Day in Munich in February 2010.
Author(s): M.S. Krzemnicki
News from the SSEF (2010)
Author(s) : -
Date : 2010
Tags : Gemstone Research
News from the SSEF Lab. 2010 Swiss Gemmological Society conference. Presentation by Dr. Michael Krzemnicki
X-ray micro computed tomography: an explanation of the procedures and benefits
Author(s) : -
Date : 2010
Presentation on x-ray computed tomography during LMHC meeting in Bahrain in 2010.
Author(s) :M.S. Krzemnicki
How to get the blues of the pink: detection of low temperature treatment of pink sapphires
Author(s) : -
Date : 2010
Latest research on detection of low temperature treatment of pink sapphires. Presentation by Dr. Michael Krzemnicki of SSEF.
Appearance of new bead material in cultured pearls
Author(s) : -
Date : 2010
Abstract: A range of different materials has already been used as cores in beaded cultured pearls, and now two new alternative options, baroque shaped shell beads and Chinese freshwater cultured pearls, are being used. Experiments with beads of the latter, approximately 6.5 mm across, have been carried out with marine Pinctada maxima and Pinctada margaritifera oysters. After 13 months, nearly 200 pearls of each kind were harvested. Cross sections and further observations of resulting pearls are described. X-radiographs and X-ray microtomography are found to generally deliver clear evidence for identification. These pearls have beenfound to be very suitable for subsequent drilling. Natural pearls also have been used as nuclei for producing cultured pearls. The material used is either non-nacreous, brown or of an unattractive appearance. This new kind of cultured pearl is diffi cult to identify, because the radiographic structures of the natural cores are masking these cultured pearls.
Journal of Gemmology (2010)
Author(s): H.A. Haenni, M.S. Krzemnicki, L.E. Cartier
Eine Reise zu den Spinellen Tansanias
Author(s) : -
Date : 2010
Eine Reise zu den Spinellen Tansanias. Gold’Or (2010)
Author(s): M.S. Krzemnicki
Interesting muscovite specimens from Pakistan: epitaxial incrustation and pseudomorphism after beryl
Author(s) : -
Date : 2010
Interesting muscovite specimens from Pakistan: epitaxial incrustation and pseudomorphism after beryl. Published in the Journal of the Gemmological Association of Hong Kong (2010).
Author(s): M.S. Krzemnicki
Künstliches Glas mit interessantem Farbeffekt – Grüsse aus dem Weltall oder doch sehr irdisch?
Author(s) : -
Date : 2010
Künstliches Glas mit interessantem Farbeffekt – Grüsse aus dem Weltall oder doch sehr irdisch?. Gold’Or (2010)
Author(s): M.S. Krzemnicki
Voyage au pays des spinelles
Author(s) : -
Date : 2010
Voyage au pays des spinelles. Gold’Or (2010)
Author(s): M.S. Krzemnicki