The word 白璧微瑕 is formed by directly combining the two-character phrase 白璧 (white jade) with 微瑕 (tiny flaw), where 白 means white, 璧 refers to a disc of jade, 微 means slight, and 瑕 means flaw; this construction literally depicts a small imperfection in a piece of white jade, creating a concrete metaphor for a minor defect in something largely perfect.