Phial of Galadriel

“…and slowly the ship slipped away down the long grey firth; and the light of the glass of Galadriel that Frodo bore glimmered and was lost.”
The Return of the King VI 9 The Grey Havens

The glittering phial that was Galadriel’s gift to Frodo Baggins in Lórien, and which later helped him to escape from Shelob’s Lair on the borders of Mordor.