Leaf Silver Hook EarringsLeaf Silver Hook Earrings Sterling Silver GEMSTONE BLACK ONYX Soft Brushed Finished Look. We believe that Nature is the best universal artist. Our collection of leaves is inspired by tropical landscapes. GEMSTONE BLACK ONYX December Birthstone, enhances the strength of protective energies, self control, decision making, intuition. It is a powerful stone as it absorbs negative energy of people to release mental stress and promote emotional well being.