This item was a custom order and can be reproduced with variations.  Each piece will not be exactly the same as I hand stamp each letter and design free hand.  All components are sterling silver and the moon is 1" in length, the disc is 5/8" and the seamless balls are 6mm.  The stars can be omitted or even added to the disc.  Feel free to request special characters or customization upon checkout in the comments section.  The pricing starts with a 16" chain.  All sizes are available.