But never, as they wandered by, Has such a beauty charmed mine eye As this with limbs so fair and slight, So gentle, beautiful and bright. O see, how fair it is to view With jewels of each varied hue: Bright as the rising moon it glows, Lighting the wood where’er it goes.

In plain words: Sita says that none of the animals she has seen ever charmed her like this one. It glows with jewels and lights up the forest like the rising moon.