I will never buy a natural pair of diamond earrings, ever!
My girlfriend is married to a very well off man and is lucky to have the real deal on her ears. Her studs are about 1.4 CT each and when I first saw them, I swore they were high-quality CZ or just some cute large studs she happened to be wearing. NO. I was wrong, they were real.
Here's where it gets interesting. They looked NO better than my own Diamond Nexus 1 +CT studs. In fact, she thought mine were real too, b.c. come on, why wouldn't they be? hahah
Moral of this story, BUY the DN studs. Save your money for other things like travel and experiences. NO one is going to check your ears for the 4 C's so it will be our little secret!