As DG sir mentioned, if 10th,2nd lord in 8th house ..we can suggest 8th lord stone..if 8th sign is aquarius , what stone we can suggest neelam or gomad?? saturn is exalted and retrograde in 4th house…as per my understanding, saturn (neelam ) can suggest beacuse saturn is 10 degree and rahu is 7 degree…and rahu is in 12th house and saturn is in 4th house…