Got engaged-not feeling the ring

Rita

I got engaged in May. The dinner and surprise was beautiful. I love my partner. But, I do not like the engagement ring. It feels too big, lacks sparkle, over all, it feels and looks kind of cheap. I found out it was purchased through Groupon for $200. I feel kind guilty for being this superficial but I want to upgrade this ring. Any suggestions on how to approach this topic with my fiancé?