Petrified Wood (Light Color) is a semi-precious gemstone surface — a A mosaic of polished petrified-wood blocks fitted together in a patchwork, each piece showing fossilized tree-ring grain and growth-ring patterns. Reads as a light, earthy organic semi-precious stone surface. slab with a polished finish, often backlit as a feature panel, vanity or bar front. A dramatic decorative stone for interior feature applications.