Figure 1. Mexican fire opal is clear enough to be faceted, and ranges from colorless to dark red. Photo by Kevin Schumacher. Emil Weis Opals (Idar-Oberstein, Germany) opened its doors in 1905, making ...
“Diamonds are a girl’s best friend”, as Marilyn Monroe sings, dripping in what are - presumably – imitation diamonds. Many such moments have solidified diamonds and other gems as rare, invaluable ...
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