This one is Merlinite, named after the wizard due to its magical properties! It's also known as dendritic opal.
It's a stone for Gemini, Libra, Sagittarius and Pisces.
It's a stone of duality that brings together light and dark that helps you deal with both aspects of your personality and will cleanse your aura.
It's known to enhance your psychic connection, organisational skills and is said to attract good luck and magical experiences into your life 
This beauty is made from fine silver and recycled 925 sterling silver.
This one is just £45 which includes free uk postage, a free sterling silver chain and comes gift wrapped.  It comes with an 18" chain as standard but you can swap it for a longer chain for an additional fee.