Diamond FAB (Floating Action Button) is a drop-in Package/Library for the Flutter framework that allows a developer to replace the aesthetics of the default round Floating Action Button with a Diamond shaped one. This Diamond FAB follows the Material Design Specification as seen in this article. The button features a 68 logical pixel default size as per the specification and a mini mode to decrease the size to 52 logical pixels. Included in the library is a default notch in the bottom application bar or bottom navigation bar depending on where the Floating Action Button is located in relation to this bottom bar. The FAB can be docked with the button bar which produces this open triangle notch and the size of this notch can be specified by the developer through the marginWidth property.