Jewelcrafting Green gems ; What should I do with these? I have tons of them after leveling JC.
I would make necks/rings and DE them; or sell them to an enchanter in bulk.
You can try to make perfect gems with them, which have the same stats as blue gems, e.g. perfect brilliant pandarian garnet and brilliant primordial ruby. The trouble is that only red gems are selling right now, nothing else is on my server.
Save the color you use and you can pretty much get a Perfect cut in 5 or less when you need to slot in your gear. Otherwise, make rings/necks and DE.