Hi somakdan,
According to your horoscope you are Capricorn ascendant ruled by Saturn. You are born in the Purva Phalguni nakshatra ruled by Venus. Saturn owns two important, 1st house and 2nd house but is placed in the 12th house (which is a dushtana) in the sign of Sagittarius. So avoid Blue Sapphire. Also moon owns 7th house which is a Maraka house. So avoid Pearl.
Venus is a Yoga Karaka for Capricorn ascendant. In your horoscope Venus is placed in the 5th house in its own sign Taurus. This planetary position allows you to wear a Diamond / White Sapphire / White Topaz / White Zircon. Wearing of a Venus gemstone will bless with intellectual advancements, progress in career, etc. It should be worn in the Ring finger of Right Hand in Silver / Platinum on a Friday. Whie wearing recite ‘Om Shu Shukraye Namah’ 108 times.
Also currently you are running through Mars mahadasha which will be operational till 11/06/2016. You may wear a Red Coral in your Right Ring finger for Mars Mahadasha. It should be worn in the Ring finger of Right hand in Gold on a Tuesday. Whie wearing recite ‘Om Am Angarkaya Namah’ 108 times.
P.S.: Gemstone Therapy is effective only when the Gemstones are natural, untreated, unheated, flawless and most importantly, are Jyotish gemstones.
Thank You