Seven Stars and Seven Stones

[Mithadan]

What brought they from the foundered land Over the flowing sea?
Seven stars and seven stones And one white tree.

The stars of the Valacirca (the Sickle) couldn't have been "brought" over the sea by the Numenoreans. I had always thought that the "stars" referred to the jewels which the lords of the Dunedain wore on their foreheads. Aragorn bore the Star of Elendil. Unfinished Tales makes reference to Isengard being searched after Saruman's departure and the Star of Isildur being found there among bones, etc.