With the new release notes out, it seems the JC's will have an even easier time getting to cash it.
Heres what I would suggest:
DO NOT SELL/CUT your green gems at all. Save them up for free random blue gems in 2.4. How is this going to make money any better than before? Well obviously the green gem prices are going to go way up with people in demand for them along with the ore prices going up as well to prospect.
1. save 100+ of each green gem
2. wait until 2.4 releases
3. get the design from the grandmaster trainer
4. click create all
5. profit
If you have the space I would suggest storing more than 100. I myself use 3 mules just for ore/gems so I plan to have 300-400 stored just for this.
A side option:
Dont create the glass at all, and wait about a week for people to find and get the design from the trainer. You will notice prices on the green gems going up and just throw them on the AH each day at mark up and profit that way as well. I can't really run any numbers until 2.4 is actually out but this is a good heads up for anyone wanting to make bank from the release.
Also if your an enchanter this will be a gold mine with the void crystal split raking in the gold as well.
Hope this helps everyone looking to get a head start on the release.