Topaz Treatments Explained: What UK Buyers Need to Know
A plain-English guide to heating, irradiation and coating in topaz, how each treatment affects value, and how to clean and buy treated stones with...
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A plain-English guide to heating, irradiation and coating in topaz, how each treatment affects value, and how to clean and buy treated stones with...
A practical beginner's guide to judging loose topaz by colour, clarity, cut and carat, with checks to run before you set the stone in a ring.