Hand Mirror
From Starfy Wiki
The Hand Mirror (Japanese: てかがみ) is a red hand mirror in Densetsu no Starfy 3, found in Coral Coast (Stage 2-1, map 2). It is Ruby's favorite hand mirror. Ruby left this item behind while moving from a pink roofed house to a larger red roofed house. Other items that were left behind are the Perfume, the Compact Mirror and the Necklace. The Hand Mirror and the other items all got stuck in bark. Starfy must ring three Coral Bells to reveal the Hand Mirror.
When Starfy and Starly give Ruby the four items, she is grateful and rewards them with the Necklace Accessory.