Valmiki Ramayana Aranya Kanda Sarga 52 Shloka 33

तस्याः वैदेह्याः Vaidehi's, स्तनान्तरात् from between the breasts, भ्रष्टः fell down, ताराधिपद्युतिः shining like the Moon, हारः necklace, निपतन् fell, गगनात् from the sky, च्युता dropped, गङ्गेव like river Ganga, भाति seemed.

Sita's necklace shining like the bright Moon slipped from between her breasts like the river Ganga falling down from the sky.