Ghost Quartz is a gentle and enigmatic gemstone character from the anime and manga series Houseki no Kuni (Land of the Lustrous). Formed from two minerals—Ghost and Cairngorm—Ghost Quartz initially presents as a single, calm entity with a nurturing personality, looking after younger gems and acting as a caretaker. Ghost Quartz's story explores themes of identity and separation, as the two minerals eventually split, revealing individual identities and relationships. Ghost Quartz plays a key supporting role in the series' exploration of self and transformation.