As Jupiter is the Lord of 9th house which is the Bhagyastan, wearing Yellow Sapphire is recommended. You can wear Yellow Sapphire life long.
Regarding Pearl you will enter Moon Mahadasha in September 2016 and therefore you can wear Pearl in Silver ring till September 2016. As Moon mahadasha is for 10 years you can wear Pearl till Moon dasha is going on.
Surya is weak as suggested earlier and Surya Mantra Jaap and Surya Namaskar is very important.