Can a Goldsmith opt for GST Composition scheme ?

7114 is the HSN code for Jewellery items and GST rate is 3% for regular. But I asked for Goldsmith's (Jewellery maker who incomes from Labour Charges) SAC code details, which is 998892 (Jewellery Manufacturing Services). But there is a lot of confusions ?

What is the GST rate for SAC 998892 ?

is SAC 998892 elegible for Composition Scheme ? if yes what is the GST Rate?