Excise exemption for specified jewellery inputs and precious stones expands duty relief for goldsmiths' supplies. The amendment exempts specified goods from central excise duty: (I) non-branded articles of goldsmiths' or silversmiths' wares of precious metal or metal clad with precious metal; (II) gold strips, wires, sheets, plates and foils used in jewellery manufacture; and (III) precious and semi-precious stones, synthetic stones and pearls. The explanation defines 'metal' to include certain alloys and sets a minimum gold-content threshold for inclusion, and defines 'articles' of gold to include finished items (other than ornaments) and gold coins or broken pieces while excluding primary gold in unfinished or semi-finished forms.