The flesh may be red, pink, orange or gold; it may have seeds or be seedless. Sone are the size of a small canteloupe. If selecting a whole melon, pick one that is symmetrical with a dull sheen on the rind, and check underneath to make sure it is yellowish-a sign it ripened on the ground. A watermelon, if truly ripe, will respond by giving up a thin green shaving if scraped with a fingernail. A cut piece of watermelon should be fragrant through the plastic wrap, and the flesh should appear dense and firm.