Answered by Shaykh Faraz Rabbani
During Ghusl on several occasions, I forgot to remove my ring. If there is a ring area that is not washed (Skin area inside my ring) would that invalidate my Ghusl? What of the prayers I have done in that day?
Answer:
Walaikum assalam,
If you are not certain that the water did not reach under the ring, you can assume that it did–and, therefore, you don’t have to worry about making up past prayers performed with such purification.
In the future, either remove the ring or move it.
Wassalam
Faraz