Currently I have created stacking ring design for our tension ring Vida .This ring has been discontinued but I am working currently on the new improved version with the greater tension strength. I found also Rhinoceros as a great design tool which you can use along traditional designing method to prototype and visualise your jewellery. It is not easy to master but you can use it for 90 days free trial. Based on this concept I design very thin 2 mm ring with smooth curve for comfort fit. Our customer has been delighted with the solution as that perfectly fit to the other ring. You can check this ring here ,where the 1 mm diamond has been added to add on some dazzle to the ring .