Carbon tension ring, optionally set with rock crystal or smoky quartz. The stone has a diameter of 15mm. Other stones can be set upon request. The ring is available in inner ring sizes from 50-70mm. 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 deducted 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).