Worry stones are smooth, polished gemstones, usually in the shape of an oval with a thumb-sized indentation, used for relaxation or anxiety relief.
 
Worry stones for stress and negativity include Moonstone, Rose Quartz, Jade, and Lepidolite.
 
If you're faced with a tough decision, go for Flourite, Clear Quartz, Amazonite, or Tiger Eye.
 
To help with grounding or centering, go for Onyx, Jasper, Smokey Quartz, or Hematite.