How Polishing rework reduction improves the production efficiency through deployment of DMAIC methodology of Six Sigma?

How Polishing rework reduction improves the production efficiency through deployment of DMAIC methodology of Six Sigma?

Surat based renowned and one of the Top 10 diamond processing industry is engaged in polishing work of diamond. In this company 60% of the processed diamonds are certified by GIA. From starting of rough stage the diamond is processed up to final polishing in the company. After final polish final 4C parameters are decided in diamond lab & then it is sent for GIA certification.

But during polishing stage the company was facing problem of 300% repairing (i.e. one diamond is processed on an average 3 times) in polishing department. This high repairing causing in high turn around time, less utilization of resources because more resources are used in rework and high processing cost (labour & overhead cost).