Cairngorm is a gemstone character in Houseki no Kuni (Land of the Lustrous), known for their elegant appearance, calm demeanor, and significant emotional complexity. They become especially important through their relationship with Phosphophyllite and their shifting sense of identity and loyalty. Cairngorm plays a major supporting role in the series, serving as a lens for themes of change, dependence, and selfhood. Their character arc explores how influence and attachment can reshape personality and purpose over time.