Sovereign Gold Bond
2.5% p.a. Assured Interest | Tax Exemption on Capital Gains on Maturity

SGBs are government securities denominated in grams of gold. They are substitutes for holding physical gold. Investors have to pay the issue price in cash and the bonds will be redeemed in cash on maturity. The Bond is issued by Reserve Bank on behalf of Government of India.
There is no restriction on the number of accounts you can open.
The quantity of gold for which the investor pays is protected, since he receives the ongoing market price at the time of redemption/ premature redemption.
There may be a risk of capital loss if the market price of gold declines. However, the investor does not lose in terms of the units of gold which he has paid for.