你是钻石闪亮亮你是太阳照我心
[nĭ shì zuàn shí shăn liàng liàng nĭ shì tài yáng zhào wŏ xīn]
Translates to 'You Are Like a Shiny Diamond, You Are Like the Sun That Lights My Heart'. A poetic expression that emphasizes how bright, valuable, and central this person is in the user's life.