These are large, HUGE, clear, beautiful, sparkling blue topaz earrings.  The description didn't say which shade of blue topaz these were, though.  The blue color was so light in the photographs I thought there was a pretty good chance these were "sky blue," but no such luck.  They are most definitely "swiss blue"--a color I don't quite care for so I'm returning them.  Yes, they have thin posts and the backs are thin and pretty worthless if you want to hang onto your earrings...all things I could have overlooked if the color was right.