Diamond is allotrope of carbon. A diamond is a transparent crystal of tetrahedrally bonded carbon atoms that crystallizes into the diamond lattice which is a variation of the face centered cubic structure.
It is the inspiration of a set of lamps, which is easily to be reordered. Each single molecule could be used separately, or combined into different variations of crystal-like structure. The size is unlimited and depends only from the number of parts engaged in the structure.