§ Of Beren and Lúthien The Silmarillion

His words were proud, and all eyes looked upon the ring; for he held it now aloft, and the green jewels gleamed there that the Noldor had devised in Valinor. For this ring was like to twin serpents, whose eyes were emeralds, and their heads met beneath a crown of golden flowers, that the one upheld and the other devoured; that was the badge of Finarfin and his house; Then Melian leaned to Thingol's side, and in whispered counsel bade him forgo his wrath. 'For not by you,' she said, 'shall Beren be slain; and far and free does his fate led him in the end, yet it is wound with yours. Take heed!'