When we issue gold as raw material to our Job Worker for Job Work and he returns that gold as finished goods,what GST treatment will be done and how to calculate the value

1. The job worker, if registered, would be required to pay GST at the rate of 5% on job charges only.
2. The jewellery manufacturer would in turn take credit of GST paid on such
   job work and may utilize the same for payment of GST on his outward supply of manufactured jewellery.
3. However, if the job worker is exempted from registration, the jewellery
   manufacturer would be required to pay GST on his input supply from the job worker [of jewellery made out of precious metal given by him] on reverse charge basis.
4. Nonetheless, he would be eligible to avail input credit of the tax so paid under
   reverse charge mechanism.

( FAQ 8: GEMS AND JEWELLERY)