Ring sizing and repair.
This is a universal necessity service for one of the highest demanded commodities in precious metals. Involves cutting, sawing, sanding, welding, and polishing the material. In all those steps there's refining that can be done to extract the gold from each step in a long term process that I will be breaking down from start to finish. The many different ways it can be done most efficiently with and without cutting into the ring. Avoiding stones to become loosened throughout the process as well.