I took my ring in to be resized and I feel like they switched out my diamond. I brought it to the store that I bought it from so I'm not sure why they would do this but ever since that day I've noticed the stone felt softer (like i could scratch it with my fingernail) and just looks different (I always noticed a black reflection when I looked at it from a certain angle and now I can't find that spot) the only thing that looks the same is one little spot on top.. what should I do???!!?!?