Gira Gira no Mi

The Doka Doka no Mi (ギラギラの実) is a Paramecia-class Devil Fruit that allows the user to transform into diamond, making the user a Diamond Human (ダイヤモンド人間 Daiyamondo Ningen). Gira Gira (ぎらぎら) is an onomatopoeia for impact. It was eaten by Aegis.