I heard that in Sri Lanka wearing buddha pendants is generally considered as a disrespect. The idea is that a fully purified person like the Buddha shouldn't be hanging below an impure head
Personally, I was unable to do that when I was a lay person. I guess, different people from different cultures have different ways. Some years back I read in an ancient Hindu text an incident where the god criticizing those who sold his statues, but the modern practice is totally different.
I don't remember a Sutta where the Buddha addressed this issue except saying, "Tathagatha is appatimo
," where appatimo means impossible to make a model of.