Well if anyone wants to practice for rdm maat, then this is your guy. He also drop the testimony, however you will only be able to pull the one in small room (solo). The ruby in the larger room is to the north of the room and if you pull it, you get the whole room on top of you. If you have a large group then you can clear the room and take him out.
The ruby is the small room is soloable and highly sleepable. Just use the old sleep/nuke routine and you should be ok. Will take a few mins tho, but he is the only ruby there, so no rush. It also good parctice for maat. In addition you might get some drops. I got a ruby and shell IV on the first kill. Well that was 30k gil right there.
After you have killed the ruby, you can farm the other quads in the room (usually 2) for some nice drops.
If you are really looking for a testi...I would go to the temple of ugg or sky if you can. I heard the drop rate in sky was very high, I am not sure if they are soloable tho. I went to temp of ugg too, drop rate sucked but the pots are sleepable. They are alittle harder than the ruby's coz they attack so fast. I went there with a few friends. I was lucky.