I think it's not about how hot the girl is, but how her self-esteem is.
When my self-esteem was lower, when girls would try to make me jealous (I still flirt with one friend who talks about hot guys all the time) it used to bother me. I would get almost angry over it.
Now my self-esteem has increased, and when girls do it I can see through them, like I'm Neo in the Matrix, and I just roll off and give them less attention.
I don't think it's useful to create verbal jealousy. There is no reason to *say* anything to make a girl jealous.
It can be useful to create physical jealousy. This would be when you dance with another girl so your target will see and notice the preselection.