Best weapons for Chaos Gem?

[Flesh]

Curious, of everyones opinion.

[Bytemancer]

The Bass Cannon of course.

[Spider]

Wat rings u got bithc?

[regiswag]

I GOT BACK UP AND PWNED HIM

[Krono]

Giant Dad jokes aside, I assume you're talking about weapons that get a high scaling with both Faith and Intelligence when you infuse it with chaos.

Dark sword gets B scaling in both, which is pretty good. There are people that'll get mad at you for it but if you wanna use the weapon I say go for it.
Gotthard twinswords also get B/B scaling with chaos, so that would be pretty good
Most straight swords seem pretty good for a chaos infusion, really just comes down to your personal preference though

[Tyrfang]

Try Carthus Curved Greatsword. Scales A/A from INT/FTH. http://darksouls3.wiki.fextralife.com/Carthus+Curved+Greatsword

[Drake Ravenwolf]

All chaos weapons that get A/A scaling are listed here:
http://steamcommunity.com/sharedfiles/filedetails/?id=684708376