First, let me say that I was disappointed in the size of these earrings. From the photo, it seemed that they were larger than their 3/4" long overall size (the photo is actually larger than the product.
That said, it's probably good that they were smaller because they were SO uncomfortable!  The way they are designed, instead of hanging straight down, the circle part pulls at your ear and bends the top of the earlobe forward, and the bottom backward-- this hurts. I tried them with different, larger flat backs (they came with the tiny backs) and that seemed to help somewhat, but not completely.
The size makes these feel more like kids' earrings than those for an adult. (But they are too heavy for a child.). The purple stone looks so dark (mostly because its tiny and has no cut for reflectivity) that it looks almost black.
I don't see myself wearing these. Perhaps if you have attached earlobes it won't be as bad, but with mine, they hurt.