Jewels
Which Jewels do you have access to?
I've had three Jewels. Bimaculatus, Elongatus, and Lifalilli. I didn't keep the Lifalilli very long and therefore know very little about it other than it's very colorful. The Bimaculatus is very easy to find at the pet shops. It might not be as colorful as the lifalilli.
The Elongatus is not very colorful compared to the other two. But it has a very attractive shape to me. It gets bigger and it is also supposedly more aggressive. I kept mine in its own tank most of the time. When I did put him with other fishes, it was with an orange pike (crenicichla xingu) and a green terror. He never got the opportunity to beat up on anybody in my care. I later added a Buttikoferi that ended up dominating the tank. One thing about this Jewel. When I saw him at the dealer's tanks, he was taking up the whole side of one tank to himself, all the other fishes were cramped on the opposite side. Perhaps you need a little caution if you decide to get this one. I've been searching for another one, actually.
I will take a digital picture of my tank with a small dempsey, firemouth, and bimaculatus jewel and try to post it here. I can manage them so far together because they are very small, the FM being the largest. I'm not sure how long this situation will work out.