New Treated Topazes

Leslie & Co. has introduced another color—Royal Red—into its inventory of diffusion-treated stones. The San Diego company introduced the first diffusion-treated topaz back in 1998, a green color now called Evergreen. The company has since produced four other colors: Glacier Blue, Teal, Champagne, and Bali Bi-Color (green and blue). Royal Red and Bali Bi-Color will be introduced at this year's Tucson gem and mineral shows. According to Leslie, these diffusion-treated topazes can withstand normal wear and tear, bench repair techniques, and ultrasonic cleaning. Topaz has a long history with a variety of treatments. Most of what you see in supplier cases has been irradiated blue, and, depending on the tone and saturation of the treatment, stones may be labeled sky blue, Swiss blue, or London blue. Very pale to light blue can be a natural color and is usually available with document
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