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Diamonds and Toads or Toads and Diamonds is a French fairy tale by Charles Perrault, and titled by him "Les Fées" or "The Fairies." Andrew Lang included it in The Blue Fairy Book.
In his source, as in Mother Hulda, the kind girl was the stepdaughter, not the other daughter. The change was apparently to decrease the similarity to Cinderella.
It is Aarne-Thompson tale 480, the kind and the unkind girls. Others of this type include Shita-kiri Suzume, Mother Hulda, The Three Heads in the Well, Father Frost, The Three Little Men in the Wood, The Enchanted Wreath, The Old Witch, and The Two Ca...