Most materials are diamagnetic, that is repelled by a magnet. Those containing any of the transition elements iron, manganese, chromium, etc., or the rare earths may be paramagnetic or attracted to a magnet. Ferromagnetic materials…
Featured ArticlesThis article was developed from information submitted by Jon Phillips, Corona Jewellry Company, Toronto, Canada. A diamond that the company acquired was only .18 carat but proved to have an inter- esting purplish red inclusion. The…
Gem NotesSpinels offer one of the best choices for jewelers looking to create attractive designs from a natural product that boasts all the attributes that gemstones are supposed to exhibit. The market is currently enjoying a…
Market TrendsIn late 2009, the Accredited Gemologists Association called attention to “ruby†products being sold as natural ruby in spite of the presence of a considerable amount of lead-glass component in the stones. In a hidden…
Featured ArticlesIt was only in the early 1980s when scientists like the well-known mineralogist and gemologist George Bosshart demonstrated the usefulness of spectrometers in gemstone analysis. Surprisingly enough, only a few laboratories jumped on the train…
Featured ArticlesIn general, the market is feeling positive as buyers are slowly returning to the marketplace. Stores seem to be filling holes in the middle range of diamonds replacing the ones they sold over Christmas. The…
Diamond MarketThe Tucson Gem Shows are widely regarded as a reliable indicator of the strength of the colored stone industry. In all the years that this author has attended, I cannot recall another year where so…
News ArchiveJust over a year ago, in the Gem Market News, we wrote about the sharp decline in gold and platinum prices for the trends page. In a 30-day period from July 15, 2008 to August…
Market TrendsAn honest, upscale jeweler sends his appraiser friend the most recent password for accessing the GemGuide online. Not a big deal he thinks, as he has experienced numerous occasions with customers having copies of price…
News ArchiveThe beryl family has an interesting range of varieties (Figure-1), with the emerald tending to take ‘centre stage.’ Some evidence supporting this comes in the form of early synthetic emeralds in my teaching collection (Figure…
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