Grade AA Uruguay Amethyst Large Sphere
 
The amethyst has been a widely popular crystal since 25,000 BC and for good reason.  It is a stone known to help in decision making and rids negative energy contained within oneself.  It is a very centering stone which can help balance emotions providing a peaceful energy and has also been known to encourage a restful sleep.
 
If you have a particularly chaotic room in your home, place this crystal there to help provide a calming aura.  I like to place my amethyst on my bedside table so I can look at it before falling asleep, especially on evenings I feel my sleeps are going to be restless.