This blue coloured gemstone is the most powerful gemstone. Neelam stone is the common name of blue sapphire gemstone. Its effect is immediate, that's why it's important to wear it only after consulting an expert astrologer, in order to avoid any negative effects. If this stone suits you, the positive changes in your life will be visible within a few days. For any query or further details visit Gemselections. in or simply contact us at 9810190140.