The center stone is the perfect size. Just slightly larger than my real 1ct center diamond. I've been trying to find a ring that is similar to my real ring to wear on vacation and this ring is almost perfect.

The center diamond is flatter at the top (the cut is different) from my real stone. It's quite obvious to me and I think it is a dead giveaway that it is a CZ. Just my personal preference though Many people might not even notice. This is enough for me to return, unfortunately.