Top panel: HST/WFC3 F110W and F160W band two-color image of the Planck’s Dusty GEMS PLCK_G165.7+49.0 and surrounding field of view. The orange solid line shows the critical curve at z = 2.236, for the gravitational lensing potential from our best-fitting lens model, derived using the position and multiplicity of the lensed images identified with HST and the PdBI (see text and Table 3). Black diamonds indicate the members of the foreground structure that were included in the lens model, and white triangles mark the position of the two compact submm emitters. The left inset shows a 9″ × 9″ wide enlargement of the submm arc at z = 2.236, “the Emerald”. In the right inset, we show the dust continuum at 850 μm from the SMA, with contours starting at 4σ and increasing in steps of 4σ; the beam size is shown in the lower left corner and the blue arrow marks the position of the stellar continuum clump further discussed in the text. The bar in the upper left corner shows a projected distance of 10″, corresponding to 50 kpc at z = 0.348 and 84 kpc at z = 2.236. Bottom panel: 15″  ×  15″ postage stamps centered on the Emerald (blue symbols) from our optical and infrared imaging obtained with CFHT and Spitzer.