Expert Columnists - Mary Johnson - Gemological Answers
Mary L. JohnsonMary Johnson has a doctorate in mineralogy and crystallography and is a former research and development manager at the Gemological Institute of America. How do you heat-treat sapphires with beryllium?Gemology expert Mary Johnson gets into the nitty-gritty of some common colored-gemstone treatments. More The skinny on some of the world's priciest gemsBecause certain colored gemstones are extraordinarily beautiful and extremely rare, they command high prices on the global market. A reader recently asked several questions about which colored gemstones carry the highest price tags. More Making sense of andesine/labradoriteWhat should jewelers know about orange-red or green andesine/labradorite feldspar? More Finding Burmese jadeite substitutesGiven the U.S. ban on stones from Myanmar, what are good substitutes for Burmese jadeite? More The skinny on cat's eye, color, Paraiba tourmalineWhat's the cause of the "milk-and-honey" effect in a cat's-eye? Can I describe all blue color tourmaline from Africa as "Paraiiba tourmaline?" More |
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