Prism Heart Compact
Purizumu Hāto Konpakuto
Transforming into Sailor Chibi Moon
Act 27 - Infinity 1, Premonition (manga)
The Prism Heart Compact was Chibiusa Tsukino's first transformation brooch, in which she used to transform into Sailor Chibi Moon. It is also referred to as the Pink Sugar Compact. The compact is never referred to as this name, as it was never named on-screen or in the manga.
Chibiusa wears it everyday on her civilian uniform and uses it transform into the regular, standard form of Sailor Chibi Moon. Like Usagi, she carries her own Silver Crystal of the future within it on a thin chain. It reacts whenever a Daimon is near.