An assortment of gemstone options;  3/4 inch car vent; stone size and color will vary.  Made in USA 
 
Amethyst- calmness, wisdom, spiritual
Carnelian- courage, endourance, energy
Citrine- positivity, optimism, confidence
Flourite- concentration, self confidence
Evil Eye - protection from negative energy
Obsdian- power, protection, strength
Tiger's Eye - protection, courage, good luck