@ Amit Tamboli,
Gem stones definitely help in reducing blood pressure and stabilizing it. But the effects depend on the quality and size of the gemstone. Also, the effects will be influenced by your life-style, medication and other gem stones that you wear.
Please don’t assume that gemstone is the complete remedy for your problem; but it can definately help you a lot.
Wishing you good luck, may God bless you and above all?
CHEERS