Amethyst

Amethyst is said to be a powerful and protective stone with a high spiritual vibration. It known to be very beneficial to the mind, adjusting its calming or stimulating properties as necessary. It can help you feel more focused and in control and improves motivation. Amethyst is also said to promote emotional centering; dispelling anger, fear and anxiety. It may also be used to assist in times of grief. 
Color:  Purple to Lavender
Chakra: Throat and Crown