Explanatory notes
… used by jewellers, goldsmiths and silversmiths for making articles of adornment or ornamentation. Some are also used … purposes (e.g., ruby, sapphire, agate, piezo-electric quartz). The provisions of the second paragraph of the … 85.22 ). (b) Stones worked so as to be recognisable as parts of meters, of measuring instruments, of clocks or …