Honestly, for that price I wouldn't expect very much at all. But if you like the look of the them, then that's what counts. The price of them is fantastic, either way.
Firstly, have them (the jeweller) probe the diamonds in from of you with a probe that can:
a) distinguish a diamond from look-alike stones
b) distinguish between a diamond and moissanite. (this is very important, because a lot of the probes jewellers use CANNOT tell the difference between the two.)
Cut, colour and clarity can make or break a diamond. The colour of the diamond really comes down to personal taste. Do you only like white diamonds? Maybe you like chocolate or champagne diamonds? Really dark diamonds can still have a wonderful sparkle to them, yet a near on colourless diamond MAY be lifeless. It depends on the individual diamonds, how it was cut.... many factors.
Do the diamonds at least sparkle when you look at them, or are they lifeless and opaque? There're diamonds that are 'I clarity' (the worst clarity) that still have sparkle to them. Again, you may be happy to have a pair of 2 carat diamond hoops with no sparkle to them, JUST BECAUSE you're getting a large diamond weight for your money, or maybe not. Only you know that.
Look at the settings closely, do they look sturdy? Check the closure, is it nice and snug? That the post is bent on one of the earrings is no problem at all, that can be sorted out in no time.
After all is said and done, and you go ahead with the purchase, still take them to another jeweller (preferably one you can trust) and get a second opinion. Have the second jeweller check everything I told you about. If you keep them, enjoy them!
PS: Sorry for the mini-essay...Oh, and if you do get them please send me a photo!
