gemstone: topaz

Topaz is a silicate of aluminium and fluorine. It occurs in a variety of colours including red, pink, orange, yellow, brown, blue, colourless and green (rare). Colour changes can be induced by heat or irradiation treatments, for example much of the pink topaz on the gem market is produced by heating yellow or brown chromium-containing stones.

Topaz is one of the birthstones for November.

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