The watermelon should not be soft, cracked, or bruised anywhere, though some slight yellow discoloration on the skin is acceptable. This usually occurs where the watermelon was resting on the ground.
A yellow watermelon can be purchased in any size, depending on how much of the fruit is needed. Yellow watermelons are generally oblong or oval in shape, and may also be sold halved and quartered, for those who do not need an entire watermelon at once. Purchasing a watermelon that has already been cut is beneficial, because the freshness and ripeness of the fruit can be more easily viewed. Watermelons are available in seeded or seedless varieties; watermelon seeds are small and black and are fairly easy to remove.