Yes, in some cases we can incorporate customer-provided materials into a custom ring. Whether we can use a particular material will depend on the material itself, the ring design, and how well it can be safely incorporated into the piece.
If you have something meaningful you'd like us to use, please contact us with some details about the material and the ring you're interested in. We'll be happy to take a look and let you know what's possible.
Please do not send any materials to us until your custom request has been approved and we've provided shipping instructions.