Sardonyx appears to have a combination of Garnet and Pearl's personalities, acting decidedly theatrical while also being able to keep up an intelligent conversation. Her demeanor is, for the most part, quite dramatic, as she prefers conversing with her peers in a manner similar to how a master of ceremonies would be to her audience, which fits her formal dress appearance. She seems to be snarky and witty, often laughs at her own jokes and remarks in a very pompous and comedic manner. She also seems to hold a very cheerful attitude towards almost anything as seen when she takes down the Communication Hub. She thinks very highly of herself and can be rather cocky at times, occasionally forgetting about others' feelings.[2] Despite this, Sardonyx is completely capable of being serious when necessary; when Garnet and Pearl fuse to escape a crushing deathtrap, Sardonyx breaks out without hamming it up or sticking around any longer than necessary. Unlike some other fusions, such as Sugilite, Sardonyx seems to possess no extra desire to exist as herself, as upon taking her final bow the first time she appears, she tells the others that if they need her "lovely" self again, to "Let Garnet and Pearl Know" before defusing without a struggle.