Roy Dasher Trophies do an engraving service. They are at 104 Church Road Higher Tranmere. 0151 652 2647, opposite Khan's Indian take away.
I've only used them to get a tag made for the dog, though I imagine they will do jewelry as well, but I would ring them to check if its very small or delicate. If its too small for them I would expect them to know someone who can do it for you though. Good luck.
Edited by Excoriator (12th Dec 2013 10:23pm)