JARGOON or JARGON (occasionally in old writings jar gounce and jacounce), a name applied by modern mineralogists to those zircons which are fine enough to be cut as gem-stones, but are not of the red colour which characterizes the hyacinth (q.v.). The name is related to Arab zargun (zircon). Some of the finest jargoons are green, others brown and yellow, whilst some are colourless. The colourless jargoon may be obtained by heating certain coloured stones. (See ZiRcoN.)