I've been looking for some earrings like these and Amazon has a fair selection from the very cheap to moderately priced.  I did some research and finally ordered these and another pair, that are currently sold out.  These came a few days ago and I was pleasantly surprised, considering the $10 price.  They are clear, sparkly crystals set in a whitish putty-like material, (which you can't really see unless you examine them with a magnifying glass), attached at the rear to a "cupped" post, as many of these earrings are.  The posts are silver and a little fragile but adequate, and I think are a bit long.  I would not sleep in these and have treated them gingerly.  So far, they have held up fine, though I've only worn them one day.

To summarize, these appear to be adequately made, pretty, shiny crystal and silver post earrings.  They are a nice size, not too large and not too small, just basically covering my earlobe.  I really can't say how long they will last but I will update if I have any problems.  Since there were no reviews I thought I'd put my 2 cents in to give you something to go by.  For the price, I am happy with my purchase.