Tree Beautiful agate is gem that has a white surface with green spots or patches on it. Tree agate is also referred to as dendritic agate. These crystals include inclusions that resemble foliage or tree branches, giving them a lovely and distinctive appearance. This gemstone, which appears white and green, is frequently referred to as the stone of pentitude and is thought to have a strong bond with nature. In order to encourage a bountiful harvest, tree agate was buried in agricultural fields. The ancient Greeks associated this stone with dryads.