An “diamond ring cum pendant” would be a jewelry piece that incorporates an round pressure diamond setting in a design that allows it to be worn both as a ring and as a pendant. The jewelry piece can be worn as a ring, with the diamond prominently set on the ring band. The diamond could be the centerpiece of the ring, surrounded by smaller stones or in a solitaire setting.
The same jewelry piece can also double as a pendant. This could be achieved by having a mechanism where the ring band can be opened or detached, allowing it to be worn on a chain as a pendant. Alternatively, the ring could have a loop or a bail through which a chain can be threaded to wear it as a pendant.
The design would need to balance between functionality as a ring and pendant while ensuring the diamond is securely set in both configurations. It might feature a convertible design where the ring shank is part of the pendant loop or a detachable mechanism that allows easy conversion.