This is a cabochon ring with a rainbow moonstone. I'm selling this because my collection has grown, and I'm organizing pieces that no longer fit. The rainbow moonstone has a high degree of transparency, and the iridescent schiller, like soap bubbles, is beautiful. The cabochon size is about 4-4.5mm. The ring is free size, approximately size 8 and up. The metal material is S925 (stamped). It's a delicate ring, so I hope you will handle it with care.