Swan Under-Mount Granite Sinks Swan granite composite sinks come in a variety of colors, sizes and models. To read more about what makes Swan sink are an ideal kitchen under mount sink. Granite composite sinks are very scratch, stain and chip resistant. All of the Swanstone models are also available in a drop in style as well as under mount and each one is available in a variety of colors. Black (Nero) Expresso (Brown), Bianca (Off White) and Granito (Beige).