Precious Stone is an old-school sport route in every sense. The bolts are well-spaced (for Shelf), the grade is stout, and the climbing is thin & technical. Begin by scrambling up the coral block at the base of the beautiful wall. A vertical, intermittent crack-like feature leads to a pair of crimps in a horizontal break. Move left towards the small tree. Climb awkwardly around the tree, clip up, and get a shake before the crux. Long cranks between thin, sharp pockets with virtually no feet lead to some better pockets and detached flake below another good horizontal break. Rest up here for one last devious, hard move below the anchor.