if it's a clean break, it's super simple. Get some instant krazy glue and follow the direction to glue it right back. Then get some flat silver paint and a fine brush, and touch up the crack line so it's invisible, good as new
I am surprised you have no idea how the toe broke off...those are polystone and his toes are pretty thick, it wont just fall off lol. There must be some heavy pressure applied. Or someone already broke it but put it back with some paper glue or something hoping noone noticed.
polystone dont just break like that..photo would help.