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We present deep and precise multi-band photometry of the Galactic Bulgeglobular cluster NGC6528. The current dataset includes optical andnear-infrared images collected with ACS/WFC, WFC3/UVIS, and WFC3/IR on boardthe Hubble Space Telescope. The images cover a time interval of almost tenyears and we have been able to carry out a proper-motion separation betweencluster and field stars. We performed a detailed comparison in the m_F814W,m_F606W - m_F814W Color-Magnitude Diagram with two empirical calibratorsobserved in the same bands. We found that NGC6528 is coeval with and moremetal-rich than 47Tuc. Moreover, it appears older and more metal-poor than thesuper-metal-rich open cluster NGC6791. The current evidence is supported byseveral diagnostics (red horizontal branch, red giant branch bump, shape of thesub-giant branch, slope of the main sequence) that are minimally affected byuncertainties in reddening and distance. We fit the optical observations withtheoretical isochrones based on a scaled-solar chemical mixture and found anage of 11 +- 1 Gyr and an iron abundance slightly above solar ([Fe/H = +0.20).The iron abundance and the old cluster age further support the recentspectroscopic findings suggesting a rapid chemical enrichment of the GalacticBulge.

On the kinematic separation of field and cluster stars across the Bulge globular NGC 6528