RETIRED JAMES AVERY SAINT CHRISTOPHER.  IT MEASURES A LITTLE OVER 3/4 OF AN INCH.  ALMOST 7/8 OF AN INCH.  IT COMES WITH A STERLING SILVER CHAIN THAT IS SIGNED ITALY AND 925.  IT HAS A MAKERS MARK THAT I CAN'T READ.  IT HAS SOME SCRATCHES FROM NORMAL WEAR.  THE CHAIN MEASURES 24 INCHES AND IS A REALLY NICE BEAD CHAIN.