J. Crew Bubble Necklace
You can purchase the necklace here
Now, if you don't have $150 to spend on a necklace, buy it from ebay. You can get a look alike in almost any color from the link below for a much more affordable $15!
*GREAT GIFT: This necklace is an awesome gift idea. If you are going the gift route, I would recommend the $15 version from ebay!