The symbol is hand stamped onto a disc. The chain is 18" long, but I can make it shorter upon request for those who like shorter chains. The disc measures 3/8" (9.5mm). The necklace closes with a spring ring clasp. It comes in a beautiful little jewelry box. Available in sterling silver and gold filled. This necklace is handmade and made to order, so please allow up to 1 week production time.