1) Jargon 2) Zircon 3) Zirconium silicate 
Jargoon or jargon (occasionally in old writings jargounce and jacounce) is name applied by gemologists to those zircons which are fine enough to be cut as gemstones, but are not of the red color which characterizes the hyacinth or jacinth. The word is related to Persian zargun (zircon;zar-gun, `gold-like` or `as gold`). Some of the finest jarg...
brilliant pale or colourless zircon
[n] - a colorless (or pale yellow or smoky) variety of zircon