I bought both for my bf and me, and here is my review :
Size : I was afraid the rings might not fit my fingers since they are quite large, but the rings are adjustable, and they fit on each of my fingers, which is awesome. The moon one is a little bit thinner than the sun one.
Color and material : just as expected, I've seen really good review on A'ROCH's products' quality, the material lasts.
About the sun and the moon : they are both discreet, the sun might be a little bit thin but still remarkable.
Conclusion : The rings are good quality and elegant, I really like them :)