  The diffractive production of high-$p_{\perp}$ jets in deep-inelastic
scattering is studied in the semiclassical approach. The $p_{\perp}$-spectra of
$q {\bar q}$ and $q {\bar q} g$ diffractive final states are found to be
qualitatively different. For $q {\bar q}$ final states, which are produced by
`hard' colour-singlet exchange, the $p_{\perp}$-spectrum is much softer than
for $q {\bar q} g$ final states, where the colour neutralization is `soft'.
Furthermore, the two different final states can be clearly distinguished by
their diffractive mass distributions.
