The Cosmic Heart Compact is Usagi's third transformation brooch, handed to her along with the Spiral Heart Moon Rod. She summons her Sailor Moon form from it by shouting Moon Cosmic Power, Make Up, and in Crystal the brooch later evolves into the Crisis Moon Compact.
Standing as the third brooch Usagi Tsukino receives for becoming Sailor Moon, the Cosmic Heart Compact arrives during the S storyline together with the Spiral Heart Moon Rod. The transformation it powers is triggered by the cry Moon Cosmic Power, Make Up.
In the anime the brooch takes the shape of a red heart edged in gold, topped with a small crownlike notch. Four gems sit along its inner borders leading to the center, where a magenta stone glows whenever Usagi calls on it to transform. The Crystal continuity gives the item extra defensive uses beyond transformation, shielding Usagi from Cyprine's mind control and raising a floating barrier against the newly awakened Mistress 9. In Sailor Moon Eternal it changes form once more, becoming the Crisis Moon Compact.

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The Cosmic Heart Compact is Usagi Tsukino's third transformation brooch, arriving during the S storyline together with the Spiral Heart Moon Rod, and it lets her become Sailor Moon when she calls out Moon Cosmic Power, Make Up.
In the anime, the Cosmic Heart Compact takes the shape of a red heart edged in gold with a small crownlike notch on top, and a magenta stone at its center glows whenever Usagi transforms.
In Sailor Moon Crystal, the Cosmic Heart Compact also serves defensive purposes, shielding Usagi from Cyprine's mind control and raising a barrier against the newly awakened Mistress 9.
In Sailor Moon Eternal, the Cosmic Heart Compact evolves into the Crisis Moon Compact.
In the Crystal continuity, Neo-Queen Serenity herself gives Usagi the new Cosmic Heart Compact after her previous brooch is broken in the fight against Death Phantom.
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