This carbon tension ring is available with either a 4mm moissanite or cubic zirconia. It can also be made with a brilliant-cut diamond as a special order. The band is approximately 7mm wide and 3mm thick. The ring is available in sizes 50-70mm inner circumference. Larger or smaller rings are available as custom orders. Don't know your ring size? No problem: Upon request, I will send you a ring sizer after payment is received, which you can keep (free of charge within Germany - for international shipments, the shipping fee for the ring sizer will be retained if the ring is subsequently exchanged). Furthermore, you have the opportunity to try on the chosen piece during the return period. This way, you can easily return the ring if it doesn't fit perfectly. I will then send you the same piece in the correct ring size as quickly as possible (free of charge within Germany if you subsequently purchase the ring).