http://wow.allakhazam.com/azuarc/JC%20gems%20list.doc
This print-out is supposed to be at least as useful to a non-jewelcrafter as to a jewelcrafter.
A few comments on JC:
-the JC gems seem to go in "chains", and this Word Doc shows exactly what I mean. One red, one yellow, and one blue design, and then hybrid orange, green and purple cuts. The green and purple sometimes swap their blue component for stamina.
-If you need any of these made, the ONLY material is the gem listed at the top in the first row. An orange, green or purple counts as both of the colors next to it, and you do not have to use appropriate colors for your sockets...you'll just lose the socket bonus.
-Note that there's a blue row of rarer gems that have their own cuts. Those are much higher skill (350) and have about 33% more to their stats than the normal green-text gems. The gem vendor stocks are about 2/3 of what's listed, if such a gem exists. In the long run, the blue gems are where the money in the craft will be made. The green gems are used for mid-range socket bonuses and for transmuting into more significant gems later on.