Opal comes in a variety of colors. 
Its good for creativity, inspiration, imagination, and memory. Opal promotes good and bad characteristics and allows bad one to come out so you can deal with them.
Its also known to alleviate depression and fatigue. It can calm an anxious mind.
This is a great stone to assist with psychic abilities.
 
 Tumbled stones are versatile being used for Reiki, feng shui, altars, and cleansing practices.