Amethyst 2" Skull

Amethyst
A must have crystal 
Extremely powerful, high vibrational and protective 
Guards against psychic attack
Enhances spiritual awareness
Helps overcome addictions and blockages of all kinds
A natural stress reliever
Helps you feel less scattered and more focused 
Helpful with insomnia
Enhances memory and and increases motivation
Facilitates meditation
Can relieve headaches
Stimulates the crown chakra
Will fade in the sunlight
 
This is approximately a 2" skull
 
Crystal Skulls
Help connect with spirit guides, ancestors, spiritual teachers and ascended masters
Can provide protection and healing when worked with
Can connect with ancient knowledge, as they are record keepers
Assist with channeling guidance
Can be held during meditation
You can also use them as part of a crystal grid
They each have their own personality and when asked, will give you their name
This is just a snippet of information.  There are many good books and articles to provide more information