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The stones will take a very smooth polish. The clear or pink, blue, and honey-yellow varieties, are especially valued. The most sought after and expensive colours are cabled 'imperial topaz'. Pale pink topaz is often backed by red foil to increase its colour. Orange stones are moderately priced. Some 'Varieties, such as purplish ones, are treated with heat or radio obtained to enhance the colour, and pink ('burnt') gem topaz is obtained by heat-treating the dark yellow stones. Yellowish brown specimens from Brazil turn red. Stones with a slight blue colour are normally irradiated with gamma rays to darken the colour. Extended heating will produce colourless stones, but colourless topaz will turn brown when radiated.