Tree Agate is a stone of inner peace. Gentle Tree Agate calms nerves, and can be combined with Clear Quartz to deepen meditation and prayer. ... Tree Agate is a highly supportive stone that boosts the immune system and regulates the balance of water in the body. Viewed as a Talisman in certain pieces of India, Tree Agate is a stone of internal harmony. Delicate Tree Agate quiets nerves, and can be joined with Clear Quartz to develop reflection and petition. Tree Agate carries our concentration to the unity of all of us, dissolving pride and egotism.