The thickness of the clip is a balance. THe clip is 4mm wide x 3mm thick. Thinner clips are possible, standard silver would bend easily. Argentium Silver is stiffer but brittle in thinner pieces and I have had some issue with thin clips made in Argentium Breaking. With the Opal inlay the opal itself should help give the clip some rigidity but that is one of those details that you have to work out a little at a time. How much is to much and how much is to little. Part of the fun is trying to find the right balance.