Forum:Any sure way to get pearlescent weapons?

Is there any sure way to get Pearlescent Weapons/Shields?

I've killed crawmerax 50+ times with friends and by myself and have yet to see a pearlescent weapon.

i've used a soldier: solo

Siren w/+2 rare items: solo

and the siren w/+2 rare items with two friends using hunters w/+3 drop more items and +2 rare items

and zilch, it makes me mad, my other friends get pearlescents from their friends on a regular basis, whats the trick here?