I'm new to the concept of diamagnetism, but it seems very fascinating, and I'd like to try a simple experiment. Say I wanted to repel a small piece of lead (or copper, both are readily available to me) about 3.5 grams, how strong of a magnet would I need? Could I just use small neodymium magnets or would a more serious electromagnet be needed? Is there a way to calculate the needed magnetic field strength and compare it to the magnetic susceptibility value of lead or copper? Excuse me if I've made any fundamental errors, as I've only really read about it a bit on the internet.