Guava stone refers to the hard seed found inside the fruit of the guava plant, scientifically known as Psidium guajava. These seeds are typically small, oval-shaped, and can vary in color from light brown to dark brown. They are surrounded by the sweet and juicy flesh of the guava, which is enjoyed fresh or used in various culinary applications. While guava stones are often discarded when eating the fruit, they are edible and can be consumed. Some people even grind them into powder for use in smoothies or as a natural supplement, as they contain nutrients and fiber beneficial for health.