An efficient chemical route to tiny (1-3 nm) gold particles has recently been reported by Duff et al. In this paper we report the X-ray structure of two of these hydrosol samples, supported on alumina. For the nominal 1.5-nm Au sample a contracted (similar to 3%) decahedral symmetry is found with a mass mean diameter (d) = 2.2 nm. The large Debye parameter B = 1.4 Angstrom(2) (bulk value 0.57 Angstrom(2)) is attributed to the strains introduced by the decahedral lattice misfits. The nominal 4-nm Au sample shows a less contracted (similar to 1%), twinned fcc structure and (d) = 3.2 nm, B = 0.56 Angstrom(2). The latter consist partly of fcc subunits of larger multiply twinned particles (MTPs).