CHAIN IS NOT INCLUDED Available In 2/3 Inch x 3/4 Inch in 14K Yellow Gold Size Reference: 17mm is the size of a US dime 21mm is the size of a US nickel 24mm is the size of a US quarter Medal is Made Solid 14K Yellow Gold Medal Height is Comparable to the Size of a Nickel Miraculous Medal Center Height is Comparable to Under the Size of a Dime The back Can not be engraved, it features an "M" surmounter by a cross with two hearts and twelve stars. This 14K Gold medal was created after a nun (now Saint) was given a vision of this exact medal front and back. The back features an "M" surmounter by an cross with two hearts and tweleve stars. This is the most popular selling medal of all.