I mention in an above comment that it's specifically the pendant that is too obviously and makes me feel exposed (Also, the pendant was the main part of the gift, $200 on a cheaper chain that came with it, which makes me feel bad about just removing the pendant during work). I also feel it may be a bit on the childish (?) side as well, if taken in a different light.

I also work in a quite a professional field and meet with multiple clients a day, there is a possibility that someone will actually take it for what it is, or that it will effect how I present myself. Which is one of the main reasons I wanted something very simple and not obvious in any kind of way.

Thank you for your opinion because it definitely made me feel more justified in turning it down. It truly wasn't what I had discussed with him, and not what I want. I just feel very guilty for not loving it considering how much thought was put into it.