Once upon a time there was a poor employee, who had a gorgeous daughter. One day this man met his rich and highly respected boss. In order to make himself more important than he was, he said that he had a daughter that could make diamonds out of rocks by crushing them. The boss said to the employee that it surely were a great skill to have, and if your daughter is as good as you say, bring her to my office tomorrow and I will put her to the test.
The day after the employee came with his daughter and she was guided into another room filled up with rocks and was then given a sledgehammer. Start to work he said, if these rock aren’t turned into diamonds at sunrise, you must die. Then he left the room, closed the door and locked it. The daughter of the poor employee sat there alone and had no idea of how to make diamonds out of rocks with a sledgehammer. After a while she became more and more terrified and finally she started to cry.
Suddenly the door was opened and in came a little man, a dwarf, and said hello to her and asked her why she was crying so badly.
She answered that she had to make diamonds out of rocks, and that she didn’t have the faintest idea of how to do it.
“What will you give me if I do it for you?”. “My Necklace” she answered. The strange man took the necklace, gripped the sledgehammer and bang, bang, bang, a diamond was made. Afterwords he started with a new rock and bang,bang,bang, a second diamond was made. The kept it going until the morning, then all the rocks were turned into diamonds.

When the boss entered the room the following morning you could literally see his eyes flick around in happiness and astonishment, but his heart were hungry for more in its lust for richness.
He had the beautiful daughter brought into another room filled up with even more rocks and ordered her to convert these rocks into diamonds before sunrise, if she was found of her life. The boss left the room and she was left for her own. She didn’t know how to get out of this dilemma once again and began to cry.
But faith wanted it different also this time. Again the little man appeared and asked her of what she would give him if he did the work again. This time it was her ring who changed owner.
The dwarf set to work and by morning the room was twinkling in diamonds.
The boss were over-happy and wanted even more diamonds, so she was showed into a even larger room filled with rocks. Then he said that she had to crush this into diamonds during the night, and if she succeeded, she should become my wife.
He thought that he couldn’t find a richer wife in the entire world, despite she was the daughter of a poor employee.
When the girl was left alone again, the little man came back for the third time and asked her for what she would give him if he helped her once more. She had nothing left to offer, but he made her promise that if she became the wife of the boss, to give her first child to him. Once again, there was made diamonds out of rocks.
The boss returned as promised by sunrise, and when he found all as he wanted to, he took her in marriage. The poor daughter became a highly respected lady.
A year after the marriage a little child was put to the world. Suddenly the little dwarf stood there again, she had completely forgotten.
He wanted what she had promised but she did not want to give away her child. She offered him everything within richness, but he only wanted the child. At the end he gave her three days to find out his name, if so, she could keep the baby.
In two days she tried to guess his name, she sent messengers all around the country to collect all weird and unusual names, but no one were correct.
At the evening the second night a messenger came home with a name that would change her future completely. He said he had passed a hut high up in the mountain, and it were a fire outside it. Around the fire it were a little funny man dancing around singing: “to-day I bake, to-morrow brew, the next I’ll have the boss wife’s child. Ha, glad am I that no one knew, that Rumpelstiltskin I am styled”.
Of course she was happy about his message, but the messenger had more to tell. He said that soon after he heard the song the whole house burst into flames and that the little man was screaming “Help, Help!”. The man went out of the bushes and helped him to extinguish the flames. Together they saved the house and the little man thanked him and said that he would be forever grateful.
The following morning the little man appeared for a new round with name guessing. Then the little man saw the messenger who had helped him stand beside the lady. He became terrified over what the sound of his name on her lips would do to him, so he chose to say that she could keep the child forever, as long as she didn’t tell anyone else his name.
She didn’t tell anyone his name before a long time after, when her son was about to have his child. Her grandson was named Rumpelstiltskin. Everybody thought that this were a weird name, but she didn’t care. It was only she and the messenger who knew the truth.
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http://www.umich.edu/~umfandsf/other/ebooks/Grimm/044.txt