- "One there was as great as a dove's egg, and its sheen was starlight in the foam of the sea; Nimphelos it was named, and the chieftain of the Dwarves of Belegost prized it above a mountain of wealth."
- —The Silmarillion, Of the Sindar
Nimphelos was the greatest of the pearls that Thingol gave to the Dwarves of Belegost in payment for their service in the building of Menegroth. Pearls were especially valuable to the Dwarves as they were not fond of the sea and had no means of acquiring them except through trade.
The first part of the name "Nim" means white in Sindarin. "Phelos" likely means pearl.