Diamantine/ˌdaɪəˈmæntiːn/ Definition 1 of 2Pro Tip 1/3Literary Flair Used to enhance descriptive language, often in novels or poetry. She moved with diamantine grace, akin to a dance. Pro Tip 2/3Visual Imagery Invokes an image of brightness and sparkle, think of light reflecting on diamonds. The chandelier's diamantine glow filled the room. Pro Tip 3/3Metaphoric Use Can be used metaphorically to describe someone with a clear, pure character. His diamantine honesty shone through his words.