fairy tale search

[amelia_petkova]

I'm trying to remember the name of a fairy tale and I'm wondering if you can help me out. In the story there are two sisters. The first one is kind to an old woman, so jewels and flowers will fall out of her mouth when the speaks. The second sister is rude, so snakes and toads will fall out of her mouth. As far as geography goes, I know that it's from Western Europe (probably the British Isles). I've looked through some collections of Grimm but so far, no luck. I'll try the Andrew Lang books next, if I can get my hands on them. The whole reason I'm looking is that I need to quote it for a poem.

Edited: I think I found it! It's probably the story "Toads and Diamonds" and is supposed to be in The Blue Fairy Book by Andrew Lang.