In reply to the lady who wrote that she didn't fully recommend these because the earring backs were loose:
I would either buy them in-store, and always check the backs before purchasing, OR if bought online, simply go into the jewellery dept. at the store if the backs seem loose, and request them to be tightened by one of the friendly employees. I've done this before, and my earrings are fine! If they cannot be tightened, they have a small supply of earring backs on hand, and they can exchange yours for you if necessary.