TUCSON — In February, during one of the annual gem shows here, Ray Zajicek displayed a stone that was not for sale: a 32-carat hexagonal crystal of red beryl — or “red emerald,” as the emerald dealer ...
Using the scientific precision of terms like “IF Type IIa”— to describe diamonds so pure they show no inclusions under 10x magnification — jewelry purveyors have long placed heavy emphasis on the ...
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