Hi Sam,
According to your horoscope you are a Cancer ascendant ruled by Moon. You are born in the Pushya nakshatra ruled by Saturn. Currently you are going through Ketu Mahadasha, and Ketu is placed in the 3rd house in the sign of Virgo.
Placement of the ascendant lord Moon in the ascendant allows you to wear a Natural Jyotish Pearl / Natural Jyotish Moonstone. It will help you during adverse planetary periods, like the Ketu Mahadasha. Pearl should be worn in the Small finger of right hand in Silver.
You may wear gem of Jupiter like Natural Jyotish Yellow Sapphire / Natural Jyotish Yellow Topaz in Right Index finger in Gold.
Mars is posited in the ascendant and is debilitated, so avoid Red Coral. Also Mercury is a functional malefic in your horoscope, so avoid Emerald.
Thank You