Leading gold suppliers to India - which include ICBC Standard Bank, JPMorgan and Standard Chartered - usually import more gold ahead of festivals and store it in vaults.
But vaults now hold less than 10% of the gold they did a year ago, the sources said on Tuesday.
JPMorgan, ICBC and Standard Chartered declined to comment.
In India, premiums over the international gold price benchmark have slid to $1-$2 an ounce, against around $4 this time last year.
Premiums were driven sharply lower by a now-closed loophole that led some Indian trading houses to import gold as lower-tariff platinum alloy, allowing some to even offer gold at a discount, Chanda Venkatesh, managing director of Hyderabad-based bullion merchant CapsGold, said.
That contrasts with the $20-45 premiums offered in top consumer China, helped by pent-up demand being released after COVID-related lockdowns, and $80 in Turkey, where gold imports have risen sharply against a backdrop of rampant inflation.
"Banks will sell where they will get a higher price," said a Mumbai-based official with a leading bullion-supplying bank.
India's gold imports in September fell 30% from a year ago to 68 tonnes, while Turkish gold imports soared 543%. China's net gold imports via Hong Kong jumped nearly 40% to a more than four-year high in August.
Indians will celebrate Dussehra, Diwali and Dhanteras in October, when buying gold is considered auspicious. After these festivals, the wedding season starts, which is one of the biggest drivers of gold purchases in India.
Thin vault stocks could force Indian buyers to pay hefty premiums to secure supplies, said a Mumbai-based bullion dealer with a bank.
(Reporting by Rajendra Jadhav; Additional reporting by Arpan Varghese in Bengaluru; Editing by Jan Harvey)
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