Originally Posted by
Leobald
Best selling gem for me is hands down Rigid Ocean Sapphire (40 hit). All hibrid gems combining 20 primary stat with 20 hit also sell well.
Getting hit capped is not that easy this early in the expansion, so there is high demand for hit gems (even though you should try to get hit capped with reforging first before you have to go to gems).
I made nice money with metagems in the last 6 months of WotLK (this was when I took up JC), so my original plan was to focus on them in Cata too, but this turned very quickly out to be a wrong tactic. No idea what changed, but metagems don't sell well.
Take all these with the customary "my server" warning, things might be different on other realms.