The Greek term that inspired the word "tree agate" means "tree-like." These are found in Uruguay, Brazil, and India. Iron and manganese minerals can be seen as inclusions in tree agate.. Tree agate is a nature's stone and wearing Agate Jewelry would bring you close to the beauty of nature and it's mystical and magical insights. It is an excellent stone to use for grounding exercises and to keep you grounded. You might protect yourself from bad and negative energy by wearing tree Agate Jewelry.