So I ordered these for my mother-in-law, not really expecting to be wowed as I was.  The cut on the stones is beautiful, the color is deep and uniform, a lighter shade than shown in the pictures, these are not London Blue as they appear, and the silver is not nearly as dark as shown.  The checkerboard cut is stunning, it gives these rocks some serious sparkle. I was impressed with the setting too, it's not the traditional plain setting but instead, has intricate detail that gives the earrings even more personality.  I'm prepared to buy a pair in Amethyst for myself, and I'm hopeful they'll be just as impressive as these.
One thing I will warn you on, I've noticed the prices on these earrings jumps a bit from day to day, I bought them for about $10 less than they're listed for at this time ...so check back and pay attention to how much you spend.