The review focuses upon recent research which has demonstrated that mo
dular or multi-component strategies for designing and constructing dia
mondoid solids can be successful if they are based upon exploiting sym
metry and functionality at the molecular level. Diamondoid networks ca
n be sustained by a wide range of moieties and attractive forces can r
ange from weak (pi-hydrogen bonds) to strong (coordinate covalent bond
s) as long as they are directional. The implications of the work in th
e general context of crystal engineering and future directions for res
earch are also discussed.