In literature, “diamond” is often employed not just as a gemstone, but as a vivid descriptor of light and clarity. Writers use the term to evoke a sense of brilliance and purity—almost as if a scene or a character is imbued with an ethereal, crystalline glow. For instance, a writer may describe an object as “a splendid diamond,” suggesting that it shines with a dazzling radiance [1], or compare the clarity of water to that of “a diamond of the purest water,” emphasizing its flawless, luminous quality [2]. This luminous imagery can extend to human features as well, such as “diamond eyes” that sparkle with an intense, captivating light [3]. Even whole landscapes might be rendered with exuberant detail, as when a setting “shone in the winter sun as if powdered with diamond dust,” creating an atmosphere of subtle, glittering wonder [4].