Edward mpynund Kaits (LABORATORY EQUIPMENT INSTALLER)

That's a sign of jaundice, caused by a bilirubin build-up in the blood. It often points to liver trouble, so you should see a doctor.

This is a very personal choice. In India, gemstones are usually recommended based on one's astrological birth chart. You should consult a learned astrologer. They will analyze your chart and suggest a stone that truly suits you. Wearing an unsuitable gem can sometimes have adverse effects, so it's important.