Personally, I would go with the Costco studs. If you read about markup on jewelry, it is outrageous, especially with diamonds. Since the stones will be small and on your ears, I think they will look just as nice as the more expensive ones. It certainly would not be the same if it were a ring that you and others will see more readily. Moissanite is another good choice, but I have lost a lot of nice diamond studs over the years, lol.