This is a three ring set I made for my wife. Top is white gold with rough black diamond, center is white gold and rough grey. Bottom is Palladium and 1/2 carat cut diamond. The rough diamonds are of the industrial grade meaning that they are not the kind that could be cut.
The fancy diamond has a rough construction band, the rough diamonds have refined bands.
One hard piece was determining how to get them to 'nestle' if worn together.