Yes you can wear Moon stone Pearl on your right hand ring finger in Silver on Monday morning. Also to stay happy change your life style. Wake up early in the morning. Do some Yoga / Meditation. After having a bath and before eating any meal. Offer Jal to the Sun. Recite Surya Mantra “Om Ghrini Surya Namaha”.
You can also Keep fast on Mondays for strengthening your Moon.