  We investigate the quantum phase diagram of the $J_1$-$J_2$-$J_3$
antiferromagnetic transverse-field Ising model on the ruby lattice. In the
low-field limit we derive an effective quantum dimer model, analyzing how the
extensive ground-state degeneracy at zero field is lifted by an
order-by-disorder scenario. We support our analysis by studying the gap-closing
of the high-field phase using series expansions. For $J_2>J_3$, we find a
columnar phase at low fields, followed by a clock-ordered phase stabilized by
resonating plaquettes at intermediate field values, and an emergent 3d-XY
quantum phase transition to the polarized high-field phase. For $J_3>J_2$, an
order-by-disorder mechanism stabilizes a distinct $k=(0,0)$ order and a quantum
phase transition in the 3d-Ising universality class is observed. Further, we
discuss the possible implementation of the columnar- and clock-ordered phase in
existing Rydberg atom quantum simulators. When taking into account the full
algebraically decaying long-range interactions on the ruby lattice, we find
that long-range interactions favor the same ground state as the quantum
fluctuations induced by a transverse field, which could make the ruby lattice a
promising candidate for the realization of a clock-ordered phase.
