Colorful Agate (Gold Foil) is a semi-precious gemstone surface — a Backlit semi-precious surface: a dense mosaic of polished multicolour agate slices with concentric banded rings and crystalline geode centres, set in metallic gold-foil grout between the slices. slab with a polished finish, often backlit as a feature panel, vanity or bar front. A dramatic decorative stone for interior feature applications.