Crystal-generation models can explore compositions and atomic arrangements beyond a fixed set of crystal prototypes, but their usefulness for a specific materials family depends on whether the generated structures retain the defining topology and whether their predicted properties remain reliable across the sampled chemistry. Here, a pretrained diffusion model is used to generate candidate ABX₃ perovskites and to examine their structural, chemical and electronic-property distributions. A connectivity-based filter distinguishes three-dimensional corner-sharing perovskites from structures that share the same nominal ABX₃ stoichiometry. The accepted set contains substantial B-site multiplicity, including ordered double-perovskite configurations that are inaccessible to the two-prototype substitution reference used here. The generated set is enriched in chloride-, bromide- and iodide-containing compositions relative to the Materials Project, while all generated B-site elements are already represented in that database. On the downstream MP-trained ALIGNN scale, the predicted bandgap distribution is shifted towards 1.4 eV, but the target-window fraction (8.2%) is close to the MP reference fraction (7.3%); the separate MatterGen and ALIGNN label sources prevent this comparison from establishing target-condition enrichment. An ALIGNN model performs well on a formula-grouped random test split but does not outperform a constant baseline on a deliberately severe B-site-disjoint test. First-principles calculations on six generated structures show that relaxation can alter structural classification and that predicted and calculated gaps can differ appreciably. These results identify both the chemical-space coverage offered by crystal diffusion and the structural and predictive checks needed before its outputs can be treated as materials candidates.