GST Invoice (Gold Jewellery)

Mayur` (.) (90 Points)

16 September 2017  
Can I make an invoice of gold jewellery say as 10 Grms rate 3000 total rs 30000 and rs 1000 making total Value 31000 and charge 3% on total rs 31000 ie rs 930 as gst
Or I have to make different invoice for gold and making cost