As a jewelry artist, I can tell you that having the right pliers when designing and creating jewelry is crucial. I have some pliers that I have owned for almost 20 years, and they are still as good as they were when I first got them. I use them constantly, and I love them.
I spent about $12 per pair of pliers when I first bought them, but they were well worth the price. Depending on what kind of jewelry you are making, there are really only a few different types of pliers that you will need. If you think you will be using them more than just a few times, you should spend between $10 to $20 per pair in order to have them last. Cheap pliers will rust or break easily, and need to be replace through regular wear and tear. Good pliers won't.