Moss Agate (Backlit) is a semi-precious gemstone surface — a Backlit moss agate gemstone slab — a bold mosaic of dark emerald and translucent green agate fragments set in a lighter cream​/​white crystalline matrix, with strong high-contrast irregular movement throughout. slab with a polished finish, often backlit as a feature panel, vanity or bar front. A dramatic decorative stone for interior feature applications.