他是太阳会发光她是钻石闪亮亮
[tā shì tài yáng huì fā guāng tā shì zuàn shí shăn liàng liàng]
The meaning is he is like the sun, radiating rays while she shines brightly like diamond. This portrays an admiring view on couples or two individuals: he's warm and charismatic like sunlight whereas she dazzles with internal brilliance similar to gems.