is the first device used by Usagi Tsukino
to transform into Sailor Moon
The Transformation Brooch was given to Usagi by Luna, when she tells her about Usagi's destiny as a Sailor Senshi.
It is a round golden brooch with a crescent moon as a decoration with four smaller round circles, one on each quarter, that represents each of the Inner Senshi that fight along side her; Red for Sailor Mars, Blue for Sailor Mercury, Green for Sailor Jupiter and Orange for Sailor Venus.
When the Transformation Brooch is destroyed in the battle with Queen Metaria it is replaced with the Crystal Star.