All of you must be aware that SGBs are actually not backed by Real Gold,Its just a promise by Gov to Honour those bonds.
The problem started when Gold has started rising sharply in Last 5-6 year, Since the Gov actually doesn't have equal amount of gold which they can sell and payback the Bond holders. Now they have to payback from their pocket.
Their plan to get literally free money has failed and now they have to pay 2.5%(Interest) + almost 150% appreciation to the SGBs bond holders.