Valmiki Ramayana Aranya Kanda Sarga 52 Shloka 30

तरुप्रवालरक्ता red like tender leaves, सा वैदेही that Vaidehi, नीलाङ्गम् dark coloured, राक्षसेश्वरम् Ravana, काञ्चनी golden, कक्ष्ये binding chain, गजमिव like an elephant, प्राशोभयत made him glow.

With her golden girdle, Sita whose complexion resembled tender leaves looked like a golden chain to bind an elephant with. (Here Ravana is the elephant).