The YR Riley Hybrid Watermelon has some very unique and unusual qualities. The surface of the coral is very rough with numerous protrusions. Corallites are large and knobby. In the valleys between corallites, the surface is a turquoise blue. Near corallite mouths the coral develops burgundy pink pigments. Corallite eyes have the typical Watermelon pigment colors. A bright green inner corallite area also contains yellow to red pigments around the mouth.