Explanatory notes
… these stones, which are usually crystalline, are used by jewellers, goldsmiths and silversmiths for making articles … therefore mainly stones intended for mounting or setting in jewellery or goldsmiths’ or silversmiths’ wares; but, … (unworked, heading 25.26 ; worked, heading 68.02 ). (c) Jet (unworked, heading 25.30 ; worked, heading 96.02 ). …