Handmade, natural product Stone: Montana Moss AgateMetal: 925 Solid Sterling Silver. Agate gets its name from a Greek word meaning tree-like. These Agates are usually colorless, white, or gray, and have tree- or fern-like inclusions of iron or manganese, called dendrites. Less common are green Tree Agates with white dendrites. Dendritic Agate is known as the Stone of Plentitude.