Mr. Vipin Katiyan
As Mr. Navneet jee explained, we should with the strength of ascendant and also the strength of other planets and their placements.
In your case Mars is lord of 6th and 11th and is in 10th. It is good. Mars is connected to 1st, 9th and 8th houses through his star lord Mercury and sub lord Saturn and also 5th house. So it is good in case of health. But it gives success over opponents and in all undertakings but as the sub lord is connected to 5th house, the people will be benefited with whom you deal. You will be put in dissatisfaction or loss.
If you put emerald for Mercury, Mercury is placed in 12th house. It loses its strength to give 12th house results as Mars is in the star of Revathy. Mercury is signifying Moon lord of 2nd (finance, speech) and 3rd (communication, writings, short journeys, younger siblings) in lagna. It is good. But Mercury is in the sub of Saturn ) lord of 8th house in 9th house who finally signifies 5th house. So there would be difficulties with your siblings, in journeys, disturbances in your profession.
It is better not to wear any stone and pray the relevant god.
It is your look out. In stone selection, we should not go as per the placement of the planets. We should see the star lord and their placement. Even if the placement of star lord is good, but the placement of sub lord is not good, then it is better not to go for a stone. In your case 5th house is connected to some planets. 5th house is good for recuperation in case sickness, love affairs and amusement etc only.
At present Saturn period is running. Saturn is in 9th house lord of 8th, 10th in the 9th house. 8th house gives you tensions, disturbances, money blockages in others (employers’ hands), 10th (profession) 9th gives change of profession. It is also the sub lord of 1st (self), 2nd(finance, speech), 3rd (communication), 8th (tensions), 9th (change of profession). Saturn is signifying Rahu in 5th (as a node signifying 6th and 11th). So in this period you might be facing troubles through your colleagues, employers etc. In writings also you may be misled by them. So be cautious.
Good Luck
JVS Rao (KP system follower)