Purity Ring??

i have a purity ring its a regular ring it has topaz in the middle and is gold and has a very smal diamond on one side but i just satrted wearing it as my purity ring today noone knows tho and i want a new one cause this is my first ring that i got for my birthday im 13 and i got the idea of a purity ring from the jonas brothers and they are stting a great example and i want a new ring and i want engraved in it ''hold on'' its one of there songs and its one of my favorites but i dont need a realy nice expensive one just want to keep it simple and cheap abd noone knows yet plz help me