Size is approximately 4-5mm. Semi-round, free size. The ring base is alloy 18kgp. ‼️Important Notes (Please read carefully): ❗️Instant purchase without comment and silent transactions are OK. Please proceed directly from the purchase button. ❗️Due to handmade nature of the product, there may be traces of handcrafting (such as wrapping or glue), and welding marks on the pendant head. If you are concerned, please refrain from purchasing. ❗️All products use actual items, and we try to photograph them as close to the real thing as possible, but the appearance may differ depending on the device. Please check the product description and photos, and make your purchase after you are satisfied. We cannot accept returns or exchanges due to reasons such as "different from the image." ❗️Occasionally, damage may occur during shipping. If you contact us before rating, we will handle returns or repairs. We do not offer a lifetime warranty for accessories. Please consult with us regarding damage caused by your own use.