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.
 
Carved crystal skulls are a symbol of hope and represent “death” which in turn represents new beginnings. Just like in tarot reading the Death card is a card of not just the end of something, but the start of something new. A new beginning. A new start. From death, comes life.