Black Agate Healing Crystal Pendant Stone with 18 inch Sterling Silver Chain - Ladies Womens Birthday Anniversary Present Jewellery Gift. A modern square of Black Agate crystal stone is polished and smoothly presented as a unusual square. Held using a silver plated swirl and 18 inch Sterling Silver Chain - this is a wonderful present to complement any outfit. Healing agate is said to eliminate and transform negative energy - its cleansing effect is thought to be powerful at the physical and emotional levels - it is said when placed on the heart it could heal the emotional disease that prevents acceptance of love. Length 28 mm, Width 28 mm, Depth 3 mm, Weight 5 gms.