no gem stone is advisable for sheetel . Only do following remedies and thing will improve like magic
1. wear Iron ring for Saturn(every body know this ring) for 3 years Must
2.recite of
Om Trayambakam Yajaamahe
Sugandhim Pushtivardhanam
Urvaarukmiv Bandhanaan
mrityormuksheeya Maamritaat. daily before going to bed/sleep

3. worship of lord Ganesha.Must and lord shiva

4.Wear of 5.25 ratti Panna on a little finger in Gold(both remedies for mercury and sun)Must

5. no ruby or moti Please

6.consider wearning 5 mukhi rudraksha mala

9. if thing turn out to be good within one year contact me or send message to me
God bless you
visit vedicastroclinic.blogspot.com

Rishi Vatsyayan