Sovereign Gold Bond 2017-18 Series X, due for maturity on December 4, are set to offer 332% returns as RBI has set its redemption price at ₹12,820 per unit. The redemption price was calculated based on simple average closing price of 999-purity gold for December 1, 2 and 3. The bonds were issued for ₹2,964 per unit in December 2017.