O look, his crimson tongue between His teeth like flaming fire is seen, Flashing, whene’er his lips he parts, As from a cloud the lightning darts. O see his sunlike forehead shine With emerald tints and almandine, While pearly light and roseate glow Of shells adorn his neck below.

In plain words: Rama keeps describing the deer: its red tongue flashes like lightning, its forehead shines with jewel colors, and its neck glows like pearl and shell.