I am surprised more people haven't posted here. Here is a pic of most of my Costco jewelry, including some non diamond pieces.
1. 1 ctw five stone ring
2. 1 ctw heart princess pendant
3. 1.45 hoops
4. .40 ish small hoops
5. 1.75 flower dangle earrings
6. Diamond and pink sapphire cross and flower pendant
7. .30 ctw tiny cross
8. .50 larger cross
9. .25 heart key
10. .20 stacking band
I think that is all my diamond pieces.