Material: Silver Purchased from a certain silver retailer. The design is like it's embracing a perfectly round crystal. From the back, the crystal appears slightly dirty. This was present from the time of purchase and may be due to the manufacturing process or the crystal itself. It's not noticeable at a glance. Thick chains or cords can be inserted. Inner diameter: 10 x 7 mm Stored in a closet for a long time. I used it occasionally before. I haven't used it for a while. I will sell it to someone who likes it.