Riddles in the Downs

[Huinesoron]

Originally Posted by Urwen

Tarn Aeluin?

Purple the heather that grows on the mountains,
Blue for the mirror that stands all alone. - the lake of Tarn Aeluin is filled with mirror-like water, and surrounded by the mountains where heather grows
Green for the jewel, the sigil of honour, - Elessar, from which Aragorn, the descendant of Barahir, took his moniker
Yellow the crown of the lord of my own. - Barahir could be the 'lord' of Tarn
Orange the standard of he who rules over, - I can't find Barahir's standard, but I assume it to be orange
Red for the fire that burns to the bone. - A reference to Dagor Bragollach, and the rivers of lava Morgoth sent forth

You're actually inside the correct answer, and you're right on your interpretation of lines 1,2, and 6.

It's not the Elessar, though.

hS