Moss Agate is a semi-precious gemstone surface — a Moss agate semi-precious gemstone slab — a mosaic of irregular angular agate fragments in mossy green, olive and earthy ochre tones, with translucent crystalline quartz banding between segments. Bold, high-contrast organic stone-mosaic surface typical of backlit decorative gemstone panels. slab with a polished finish, often backlit as a feature panel, vanity or bar front. A dramatic decorative stone for interior feature applications.