Immediate examples are works by Shrestha et al and Deumel et al demonstrating ~13 mm diameter by ~1 mm thick MAPbI3 polycrystalline ceramics with relative densities ()defined as the polycrystalline ceramic's density divided by the material's theoretical maximum density-of ≳0.90. Interestingly, these ceramics were formed at room temperature, requiring only ~5 to ~30 minutes of uniaxial pressing of solution-made powders at ~75 to ~300 MPa. The ability to rapidly produce MAPbI3 ceramics has been linked to plastic deformation based on nanoindentation measurements. Lead halide perovskite ceramic-based direct X-ray detectors demonstrated conversion efficiencies comparable to state-of-the-art CdTe detectors, illustrating the utility beyond academic interests. In tandem, facile fabrication methods and demonstrated radiation detection capabilities have motivated intriguing, recent research into pressed powder processing of metal halides (e.g., MAPbI3, MAPbBr3, MAPbCl3, CsPbBr3, CsSnI3, CsSn(Br0.5Cl0.5)3, Cs2AgBiBr6, (CH3NH3)3BiI9, and ([C6H5]P)2MnBr4 ). Despite increasing research on this topic, freestanding ~1 mm thick halide perovskite ceramics with high optical transparency have yet to be demonstrated. Lack of transparency to visible and infrared light stymies the potential integration of perovskite ceramics in a number of applications. Moreover, high optical transparency itself signifies enhanced ceramic density, minimized pores, and a lack of impurities/secondary phases at grain boundaries. These characteristics should lead to enhanced perovskite semiconducting properties as well as improved mechanical durability. Thus, optically transparent perovskite ceramics may not only demonstrate enhanced performance in Xray/-ray detectors but may also have potential utility as nonlinear optical components, scintillators, or rare-earth doped solid-state lasers.