Black Agate Jewelry - Choose the Uniquenes Black Agate Healing Properties are famed worldwide and it is a stone of wonder. The black color in your gemstone signifies protection – from evil and negative energies and helps to keep them at bay. According to color psychology, the Black color symbolizes elegance, power, and control and enables you to stand out from the crowd. It is a stone of pure ink and thus various statement pieces of jewelry like Black Agate Necklace are famed for the stunning look they add. This gemstone has distinctive patterns and layers that add value to the beauty of the stone and make it the most charismatic out of all agate gemstones. The color of the layers inside the stone is generally black, dark brown, and dark grey.