Thank you for the very fast response to all my questions! Thank you for adding the extra material options on the site and the alternate angle view which is so helpful. As you mentioned, the larger ring holder is scaled to US size 8.75, and will work with a larger or smaller ring within a size or so, and would be the most likely appropriate for either of my two rings, (sizes 7 and 9 1/2). Since I would ultimately want to order one in gold, I have decided it would be safer to not rush, but to order both sizes in nylon plastic first to try out with my rings. The stones are not small, and I want to be sure on which size the heads/stone mountings on either ring will sit, or drop below, most comfortably. Your advice and also the availability of the economical plastic models to try out are great help. It will also give me extra time to decide which color gold to choose;) Thanks again!