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In antiquity, yellow, brown, and sometimes green gemstones were called "topaz". The name probably came from the name of an island in the red sea, now Zebirget, but formally "Topazos". The colored stones are rarely vivid. The most common is yellow with a tint of red. The most valuable is pink. Siberian topazes lose some color in the sunlight. Scratching the rough stones is inadvisable due to cleavage. Care should be taken in the polishing and setting for the same reason.. They are not resistant to sulfuric acid.