This is the one you will receive - 39mm x 18.6mm 

Excellent for cleansing the blood.  Heightens intuition and increases creativity.  Very good grounding stone and very protective.  It gives you courage and teaches you how to avoid dangerous situations.  Helps you to stay in the present moment.  Reduces irritability, aggressiveness and impatience. Healing: energy cleanse. Stimulates flow of the lymph and metabolic processes, helps to revitalise and re-energize when mind and body are exhausted.  Egyptians used it to reduce tumours.