What is best way to hang outdoor chandelier on tree branch?

I've been working on a chandelier, repurposing it for a area if the yard over a table  . The only way I see to hang it is to throw a rope over a tree branch the juts out . The branch is about 5-6 inches in diameter and is high (25ft?) up. What type of rope ,cord,or chain should I use  ? I'm thinking that something with some weight to it is needed to reduce the chandelier swinging in the wind or storm . How have others done this part of the project?  . What is the best solution?