Pros : These are "medium" but they're the largest size I use and I've never had an issue with the weight making it bend or break. In over 5 years of use I haven't seen any tarnish, though I haven't left them exposed to any chemicals
Cons :
Other Thoughts : I often use these with 3" or 4" circles when I host ornament workshops with Girl Scouts. So I know with E6000 they can take a good bit of weight, but I might suggest epoxy for anything being worn regularly by a person, esp if they fidget with it