I purchased this 925 Sterling Silver Celtic Knot Eternity Band Ring from Metal Factory
It is a very nice ring. My first thought when I opened was how thin it was (my fault for not reading it was 4mm) but that is ok I decided to just wear it on a finger with another ring and it works out good. I have been wanting a celtic knot ring for quite some time so I am happy that I have one. I will eventually purchase a thicker one but will still keep this one as well. I cannot comment on customer service as I have not had to contact them. I definitely recommend the ring it is great quality just make sure you realize it is 4mm.