The GST Council's decision to impose a 3% GST on gold will not only make jewellery costlier but also lead to a higher incidence of illegal gold trade, industry experts have said.They also said bringing the unorganised gold sector into the GST ambit will be a challenge. “With GST, the total duty has become very high and the customs duty maybe revisited,“ said Ajay Sahai, director general at Federation of Indian Export Organisations.“The duty could be one of the highest among major gold consuming countries, which could lead to high incidence of smuggling." India, China and West Asia are the world's leading gold jewellery markets.On Friday, the GST Council also fixed a GST rate of 3% on silver, gold jewellery and processed diamonds, which is higher than the industry estimate. With an existing 10% import duty, consumers will have to pay an effective duty of 13% on gold jewellery, up from the earlier 12.5%, which comprised 10% import duty, 1% value-added tax, 1% excise duty