April's birthstone is the diamond, whose color is clarity itself: brilliant, near-colorless white light.
A diamond's classic color is no color at all, a clear brilliance that splits light into flashes. In palette terms it reads as the purest cool white, sometimes with an icy blue cast.
The diamond stands for strength, permanence, and enduring love, which is why it anchors engagement rings. Its neutral brilliance pairs with anything and signals timelessness.
The palette
The colors
Colors that have their own encyclopedia page link to it; the rest show their exact hex.