In a ruling that may have implications for gold mortgages, gold bonds and commodities derivative trading, Karnataka Authority for Advance Rulings has held that deposit of goods to a custodian with obligation to return on submission of electronic receipts would not be liable for GST. The ruling came in relation to applicability of goods and services tax in case of a derivative contract in diamonds through Indian Commodity Exchange. The authority held that mere deposit of diamonds with safe vaults acknowledged by electronic vault receipts does not constitute a supply for levy of GST.