This pendant is 25mm diameter, and comes with this long necklace chain. The chain is 24" in length, but can be shortened upon request. This pendant has a clear epoxy finish to protect the image. It is water resistant, but not waterproof. It has a very nice antiqued look to it. It is a metal tray with a very high quality piece of glass, NOT plastic, set into it over the image. They are made to last and very cute in person! Thank you very much for shopping in my store, I hope you find something you love!