Seven Stars and Seven Stones

[Lord Gothmog]

You beat me to it Ultimatejoe but the quote you are thinking about is.

They stooped over the dark water. At first they could see nothing. Then slowly they saw the forms of the encircling mountains mirrored in a profound blue, and the peaks were like plumes of white flame above them; beyond there was a space of sky. There like jewels sunk in the deep shone glinting stars, though sunlight was in the sky above. Of their own stooping forms no shadow could be seen.
'O Kheled-zâram fair and wonderful! ' said Gimli. `There lies the Crown of Durin till he wakes. Farewell! ' He bowed, and turned away, and hastened back up the green-sward to the road again.

That fact is the door was the point at which Khazad-dûm and Erigion touched So it is not surprising that they bare the tokens of both the House of Durin and of the High-elves.