Out of all the blue stones you can get, I'm thinking the best is still the awesome blue that you get in Blue Sapphire. The thing is, a natural stone this clear and with this color would set you back $5-6,000. I don't have that kind of money, and I'm guessing you don't either.
These stones are so full of life and sparkle. They are set into a traditional basket setting, hanging from Sterling Silver threaders.