Indians own more gold than the citizens of any other country. They use the glittering metal as ornaments to flaunt family wealth, as a source of retirement savings and as insurance against calamities. But lately, gold has become something else: collateral, and the basis of one of the country's fastest-growing businesses, gold loans. While pawning the family jewels would be a sign of distress in the West, trading gold for cash increasingly is viewed in India as the equivalent of taking out a home equity loan to expand a business or simply to buy things. “This is the rural credit card,” said V. P. Nandakumar, chairman of the Manappuram Group, one of the country's biggest gold loan companies. “This is the only way really that someone gets an instant loan within three minutes.” But loans against gold are also a measure of how immature — and restricted — India's credit markets are. Most Indians, especially those working in the informal economy, which accounts for 92 percent of the country's 400 million workers, have few choices when they need to borrow money: they lack other collateral or have no documents to prove their incomes. Gold loan firms have also benefited from the financial crisis. In the last year and a half, many lenders have stopped making unsecured personal loans here because of rising defaults in India. It is now “a lot more palatable for banks to give loans against gold jewelry,” said Viren H. Mehta, a national director at Ernst & Young India. As a result, for borrowers like Vishwanathan C. R. Pai, a rickshaw repairman, gold loans are an essential financial tool. He frequently hands over his family's jewelry at Muthoot Finance to pay operating expenses for his business. He often borrows 10,000 to 25,000 rupees ($200 to $500) to buy spare parts, repaying the loans when customers pay him. He pays 15 to 18 percent interest. Mr. Pai said he couldn't get a business loan from banks because they wanted documentation of his income. But his customers, who earn as little as $100 a month, don't do checks and invoices. As recently as a decade ago, people like Mr. Pai who needed cash had to turn to relatives or moneylenders. India's mostly state-controlled banking system rationed credit tightly, lending mostly to the wealthy or to industries with government backing. Pawnbrokers and money lenders have long operated in India's back alleys, making loans against jewelry to families in distress, at interest rates of 30 percent or more. But gold loans made by banks and finance companies are different. Rates are lower — 14 to 30 percent — and their businesses are regulated. There are no publicly available aggregate data about gold loans, but finance companies that specialize in them are growing fast. Manappuram, a pioneer in the business, made $730 million in gold loans last year — up from $397 million a year earlier. Muthoot Finance, a privately held firm, says its lending is growing at 60 percent a year. Though the financial system here has become more inclusive, it still doesn't reach many people. More Indians, for instance, own gold than own stocks or mutual funds. The total value of gold in private hands is roughly 60 percent of deposits in banks, according to data from the World Gold Council and India's central bank. Historically, many Indians bought gold because they lived too far from bank branches and because high inflation devalued their rupees. This, economists say, kept the equivalent of billions of dollars in savings out of the financial system where it could have been lent out to build factories and pay for homes. Even though interest rates are still high and these loans don't help the truly poor who have little or no gold, analysts say they do represent progress of a sort, allowing families to leverage some of their most valuable assets for productive uses.