There is a chest in black forest that is bugged. U can click it and get 5 small sapphires as many times u want. Ppl have been abusing it to get cash. Im not sure were the chest is but they said in black forest.
Shouldnt be hard to check logs for who has been abusing it.
Just someone spreading BS rumors, checked the whole map of blackleaf to be sure (made the content myself anyway) and there isn't a single chest/quest that gives gems/sapphires in Blackleaf.