Hi Chris, The Greenest gold you will probaly find will most likely be
in the 10k range. Green gold in the 18k is not as green. You could
contact United precious metals at 800-9993463 ask for vinnie at ext
129. He should be able to let you know what the absolute greenest
alloy is. If you need a caster for it, please let us know.
Daniel Grandi http://www.racecarjewelry.com model moldmaking,casting
,finishing in Gold, Silver , Brass, Bronze and pewter