What is the rate of GST on jewellery making charges ?

Is there any option to claim ITC for Goldsmiths (Jewellery makers, not sellers) ? If yes, then from which items they can claim ITC ?

But in case of job work of registered customers, the GST rate is 5%. Am I right?

Also tell me, can a Goldsmith (Jewellery maker, not seller) claim ITC in regular scheme? If yes, then on which items ITC should be claimed?