Moss agate is said to encourage tranquility and emotional balance.
Moss Agate Meaning and Properties - 
… "Stone of Mother Gaia," is celebrated as a lucky amulet, with its green hues evoking feelings of being close to nature and its ability to uplift and soothe .  Moss Agate Meaning
is also said to have spiritual and metaphysical properties. It is believed to stimulate creativity and enhance one's connection with nature.