Precious metal customs exemptions amended with revised rates and compliance conditions for imported spent catalyst and ash containing metals. Amends the customs exemption framework for gold, silver, coins and other precious metals by revising entries in Notification No. 11/2018-Customs and Notification No. 11/2021-Customs. The amendment expands and restructures tariff coverage for precious metal goods, substitutes and omits specified serial numbers, and introduces revised treatment for certain headings including gold and silver, spent catalyst or ash containing precious metals, gold, silver and platinum findings, and other goods under the relevant precious metal headings. The notification also revises the rate entries for several specified items and creates a concessional structure for imported spent catalyst or ash containing precious metals subject to compliance with specified import rules and environmental certification.