These earrings are great!  They have sparkle and really cut up in the light.  Not as much fire as the real thing, but they are very close.  The prong setting looks like white gold or platinum.  Unless you hang out with jewelers or someone with a trained eye, or you tell someone, no one will know these are fakes.  These studs are very appropriate for everyday use.  Each individual stone is exactly 6mm in lengh and width, which is just a hair under 1/4 quarter of an inch.  Each individual stud looks to be about one carat.  They don't feel heavy on my ear.  They are a believeable size and can pass for the real thing.  If I had gotten a 5mm stud, as I had originally planned, I would have been very unhappy with the smaller size.  The backings are snug and secure. I may buy a disk backing just to make the stud stand up a little more.  But, if I don't, the earrings will still look good.  I have slightly larger genuine stones reserved for special occasions, so if I lose one of these during everyday use, I won't be heartbroken.  P.S.:  I had a bad experience with the U.S. Post Office delivering these, but Amazon stepped in and took care of the problem promptly and courteously.