What Is A Water Apple? Water Apple is a delicious South East Asian tropical fruit known for its thirst-quenching properties. Rich in fiber, calcium, magnesium, potassium, and Vitamin C, its ripe fruit possesses bright red colour, crunchy texture, and great sweetness. Other commonly used names for it include, “Rose Apple”, “Java Apple”, “Chambakka or Jambaka fruit”, “Wax Apple”, and “Watery Rose Apple”.