[en] We present a revised color-magnitude diagram of NGC 6624, a globular cluster coincident with the bursting X-ray source 3U 1820--30. The horizontal branch lies at V=16.05 mag; with the adopted reddening of 0.25 mag, we determine a revised distance of 8.3 +- 1.2kpc. The [m/H] derived from the slope of the giant branch is -0.7, which makes NGC 6624 one of the more metal-rich clusters in the Galaxy. The one RR Lyrae variable star in the area may be a field star; a red variable near the cluster is probably a member