What is this necklace called that megan fox always wear?

What is this necklace called that megan fox always wear?

& where can i find it ?

http://www.whosdatedwho.com/fashion/pictures/8L/33/833_large.jpg

http://www.tvshark.com/photo/?n=Megan+Fox+Teal+Necklace&c=4&m=5&l=1

http://www.celebritysmackblog.com/2008/09/17/megan-fox-at-the-eagle-eye-premiere-los-angeles/fox-2/