Caring for ruby earrings in a humid climate involves some essential steps. First, store them in a cool and dry place to prevent moisture exposure. Regularly wipe the earrings with a soft, lint-free cloth to maintain their shine. Avoid wearing them while swimming or in chlorinated water, as chemicals can harm both the metal and the rubies. Lastly, have your ruby earrings professionally cleaned and inspected periodically to ensure their longevity and brilliance.