Is there any correlation between nail color and one's health?

Yes! Indeed, nail appearance can indicate a person's general health. Dark spots in the nails and adjacent cuticles should be evaluated by a dermatologist for malignancy. Other nail abnormalities (ridges, pitting) can be associated with a variety of medical conditions and should also be evaluated by a dermatologist, particularly if you have other symptoms indicative of disease.
Nails and health. One the most underlook signs of health problems is the clubbing of nails also known as drumstick fingers is associated mostly with heart and lung disease its pressence is associated with 60% probability that disease is present and usually serious such hyperthyroidism, lung cancer, chrons disease and other diseases. This is lucky sign because your body is calling for help before it becomes serious.