The term "gold shell" can refer to a few different things, depending on the context. In a literal sense, it can mean the shell of a mollusk or crustacean that has a golden hue or appearance. In a more figurative sense, it could refer to a golden exterior or encasing of an object. When searching for synonyms for "gold shell," one might consider terms like "gilded exterior," "golden coating," "auriferous casing," "shimmering covering," or "metallic armor." Each of these phrases conveys the idea of an outer layer or coating that is reminiscent of gold, whether in color, texture, or value.