Erosion rings. Solid, recycled silver with copper, brass and gold inclusions.
Each of these rings is made by bringing the silver up to an almost molten temperature, then adding the other metals to the liquid surface, where they fuse and produce a unique surface texture and colour.
I occasionally oxidise the silver too, for a darker look.
These rings can be made to order so please let me know which ring from the images you prefer and I will make yours to look similar, but it cannot be exactly the same: I will however ensure you are satisfied and send you images prior to sending.