The face-centered cubic cell has one lattice point at each corner and one lattice point on each cell face. Each face is shared with one additional cell, so with 6 faces there are four unique lattice points in face-centered cells. Diamond crystallizes as face-centered cubic. The cubic close-packed structure is tied with hexagonal close packed for the most efficiently packed lattices. Because of this many elements crystalize into the cubic close packed structure including copper and gold.