Details the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s until the 1970s.
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Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.
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A new microlithography process developed to create high-resolution diffraction grating patterns on portions of certain facets can improve the dispersion of light and thus the amount of “fire” in a diamond.
Read MoreThere have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.
Read MoreThe surprising inner world of inorganic inclusions in amber is explored through the use of polarised light and microscopic techniques.
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This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreSignificant amounts of gem-quality sodalite/hackmanite—some unusually transparent—have been produced.
Read MoreUsing a multi-step process, Lucent Diamonds has developed a new treatment process for certain natural diamonds that creates colours from pink-purple to red to orangey brown.
Read MoreExamination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor.
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