Andvaranaut

In Norse mythology, Andvarinaut ("Andvari's Gift") was a magical ring capable of producing gold, first owned by Andvari.The mischievous Loki tricked Andvari into giving Andvarinaut to him. In revenge, Andvari cursed the ring to bring destruction to whoever possessed it.Loki quickly gave Andvarinaut to Hreidmar, King of the Norse dwarves, as a reparation: Loki and the other Æsir had inadvertently killed Hreidmar's son, Ótr. Ótr's brother, Fafnir, then killed Hreidmar and took the ring.  Sigurd (Siegfried) later killed Fafnir and gave Andvarinaut to Brynhildr (Brünnehilde). Brynhildr committed suicide when Sigurd left her.
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[Norse] A sorcelled ring of Norse mythology, andvaranaut seeks out gold and was the possession of Andvari, until Loki stole it. Andvari hexed the ring and into gave bad luck and pain to all who beheld it. Loki gave the ring, which he regretted stealing by now, to King Hreidmar of the dwarves, as reparation for the murder of Otter, Hreidmar's son, accidentally. When Fafnir killed Hreidmar, he took the ring. Wagner told the story of the ring in his famous operatic cycle Der Ring des Nibelungen, which charts the progression of the ring from Andvari to the end, showing the endless stream of misfortunes that befalls those who hold the beautiful ring. Some have said that andvaranaut is the basis for the modern urban legend about the Hope diamond, which is also beautiful and worth a fortune, but is said to bring pain and misfortune to all who hold it.