This is a set of a "Tenshi no Tamago" (Angel's Egg) necklace and ring. I received it as a gift, so I can't say for sure what the materials are, but it looks like there are markings of "SILVER925" and "K18". Please check the images. The ring size is size 9. I haven't used it since I received it, and it has been stored at home, but upon inspection, there appears to be a small scratch on the side of the ring (image 9).