def offstage_diamond_showcase(proposal="a breathtaking display of gemstones", kickstart_again=lambda: print("initiating the event, stay tuned!"), bypass_precursory_checks=lambda x: "all systems go" if x else "review needed", gem_collection=["ruby", "sapphire", "emerald", "diamond"]): [print(f"{gem} sparkles brilliantly, a precursor to the diamond's grandeur.") for gem in gem_collection if gem != "diamond"]; kickstart_again(); return bypass_precursory_checks(proposal not in offstage)