Cutout images of the Cosmic Gems Arc (top) and the candidate counterimage (bottom), showing the Lyα-break using the JWST bands only. The field of view of the cutouts is 5″ × 6″, and the images are shown with north up and east left. The stacked images blueward (F090W + F115W) and redward (F150W + F200W + F356W + F410M + F444W) of the Lyα-break are shown in the left and central panels, respectively. The right panels show color composites in the NIRCam filters. The Cosmic Gems Arc has an extremely strong NIRCam F115W−F200W break of >3.2 mag (2σ lower limit), is undetected (<2σ) in all bluer filters, and has a very blue continuum slope redward of the break. The candidate counterimage has similar colors to the arc, but is 3.9 mag fainter, with an observed F200W magnitude of m_AB = 28.4, fully consistent with the LENSTOOL-A model prediction of the counterimage being ∼3.7−4.7 mag fainter. The predicted locations of the counterimage from the LENSTOOL-A and GLAFIC models (star symbols in the bottom-center panel) are within 1﹩\mathop{.}\limits{^{\prime\prime} }﹩8 and 2﹩\mathop{.}\limits{^{\prime\prime} }﹩2 of the candidate counterimage, respectively.