I did a google search on St. Christopher. Here's some wikepedia on who he was, "General patronage
Christopher has always been a widely popular saint, being especially revered by athletes, mariners, ferrymen, and travelers.[7] He is revered as one of the Fourteen Holy Helpers. He holds patronage of things related to travel and travelers: against lightning; against pestilence; archers; bachelors; boatmen; bookbinders; epilepsy; floods; fruit dealers; fullers; gardeners; for a holy death; mariners; market carriers; motorists and drivers; sailors; storms; surfers[8]; toothache; and transportation workers.
[edit] Patronage of places
Christopher is the patron saint of the many places, including: Baden, Germany[7]; Barga, Italy; Brunswick, Germany[7]; Mecklenburg, Germany[7]; Rab, Croatia; Roermond, The Netherlands; Saint Christopher's Island (Saint Kitts); Toses in Catalonia, Spain; Mondim de Basto, Portugal; Agrinion, Greece; Vilnius, Lithuania; Havana, Cuba; and Paete, Laguna, Philippines.".
Here's a link that shows that little alien looking fellow on another piece of jewelry with the same sun rays type coming from around his head, http://www.qualitysilver.co.uk/acatalog/silver-st-christopher-r2658-1.jpg
I read on another link that it was believed that whomever saw an image of St. Christopher would not die that day. Makes me want to get a ring with his picture on it.
Maybe try researching him a bit yourself and see what you can find.
I could only hope to find something like that myself someday, the find of a lifetime!! Congratulations!