Metal wears over time and rings are the most common pieces of jewellery that need to be repaired because they are worn the most.
If you notice your ring is much thinner under your
finger than the areas in between your fingers, your ring may need to be re-shanked.
half where it has worn thin
This is the process where the thin area of metal is cut out and a thicker piece of metal is soldered back into place.
If a thin ring has cracked it can be soldered back together but a good Jeweller will also suggest re-shanking for a longer lasting solution.
20 Tips on maintaining our Jewellery, Gillian E. Batcher, 2013