The unit cell for diamond-like crystals is a superposition of two FCC cells, displaced by {1/4, 1/4, 1/4} times the latice constant. Examples of diamond cubic crystals are silicon and germanium.
Zincblende structures are like diamond cubic structures, except that the two interpenetrating FCC lattices have two different kind of atoms. Gallium arsenide is a example of a material with zincblende structures.