This is a pendant made with a blue stripes agate cabochon.  With the bail it is approximately 40mm / 1.6 inches long.  
 
Agate is an excellent stone for rebalancing and harmonizing body, mind and spirit.  It cleanses and stabilises the aura, eliminating and transforming negativity.  Agate enhances mental function, improving concentration, perception and analytical abilities. 
 
The pendant will arrive in a small gift bag with an 18” waxed cord necklace.