Blue pomelo is a rare variety in green pomelo. Usually, most of the green pomelo in the fruit market is imported from Thailand. Whether this grapefruit is mature or not, its skin is green. You can judge whether a pomelo is ripe or not by its weight and skin. Generally, the surface of green pomelo with good maturity is smooth and flat, the fruit weight is heavy, the fruit stalk is fresh and wrinkle-free, it tastes sweet and juicy, and the taste is good.