Grey Agate (Backlit) is a semi-precious gemstone surface — a Backlit semi-precious agate slab assembled from individual agate slices, each with concentric banded rings and translucent crystalline geode centers; warm grey, cream, amber and white tones glow when illuminated. slab with a polished finish, often backlit as a feature panel, vanity or bar front. A dramatic decorative stone for interior feature applications.