Central tax exemption for nominated agency gold supplies requires export of jewellery within prescribed timeframe and proof of export. Exempts the whole of the central tax on intra state supply of gold by a Nominated Agency to a registered recipient under the Export Against Supply by Nominated Agency scheme, subject to compliance with the Foreign Trade Policy and Handbook of Procedures, export of jewellery within the prescribed period, and submission of shipping bill or bill of export showing the recipient's GSTIN and export invoice within the prescribed timeframe; failure to produce proof of export makes the Nominated Agency liable to pay the central tax with interest.