Bad bad bad bad bad bad.........bad bad bad idea.
You put a male and a female together and you'll have:
1)unhappy chams
- Chameleons are SOLITARY beings. The do NOT associate with other chameleons unless it is for breeding purposes.
2)gravid female
- The male WILL get to her and you will have eggs. The may seem fine for the first day or two when house together because they are mating. After that, she'll hiss and gape at the male and it'll lead to my next point.
3)possibly very hurt chams after a while
-The female will gape at the male when gravid so she'll probably bite him.
All in all.. housing panthers (veileds and many other chameleons) together in an enclosure that is home appropriate (there are some exceptions) is a bad idea as you'll have more problems than what you want.
You can get just another cage which will make your life much easier. Just dont let them see each other.
Unless you have an enclosure that is huge (i mean waaay bigger than a 24x24x48"), dont house any 2 panthers together.
Also, if you have a female you're gonna have to be prepared for eggs.. even if not mated, females will produce eggs (infertile). You'll have to provide her a laying bin, privacy, lots of TLC.