§ Of the Ruin of Doriath The Silmarillion

There came a night of autumn, and when it grew late, one came and smote upon the doors of Menegroth, demanding admittance to the King. He was a lord of the Green-elves hastening from Ossiriand, and the door-wards brought him to where Dior sat alone in his chamber; and there in silence he gave to the King a coffer, and took his leave. But in that coffer lay the Necklace of the Dwarves, wherein was set the Silmaril; and Dior looking upon it knew it for a sign that Beren Erchamion and Lúthien Tinúviel had died indeed, and gone where go the race of Men to a fate beyond the world.