I purchased this a while ago and have been storing it. The top is 3cm, 3.7cm including the round ring. There are small scratches, but it has been polished and is clean. *925 stamp present The necklace is 50cm long with a 925 stamp (Image 9) I remember buying the top for around 10,000 yen and the necklace for a little over 20,000 yen. ***Important Notes*** *The spring clasp on the necklace is broken (Images 7 & 8). It can be opened and closed manually. Please purchase only if you can judge from the photos and understand that this is a used item. Please feel free to ask any questions in the comments. Please refrain from purchasing if you are overly concerned about details.