Violet (common color name / hue / variety / modifier): Abbreviated (V). Violet (Hue) with light through dark (Lit) and weak through strong (Sat) that may contain a tinge of blue (bluish violet) or gray (grayish violet) resembling the average colour of the violet flower (Viola ordorata) . Violet is also one of the spectrum colours positioned between the ultraviolet and blue in the 390 nm to 430 nm wavelength region (Guild 1931 ; Tilton 1979). In many fields of colour work (art, textile, etc.) violet is considered a colour variety (hue) unto its own, distinctly different from the adjacent hues (blue and purple) on the colour wheel. However, violet does not occur as a bona fide colour variety in natural diamonds. Colour measurement tests conducted by the author on several so-called violet colour diamonds showed that such diamonds exhibit weak saturation (e.g ., C* < 5), which properly classifies such colours as gray (i .e., violetish gray or violet-gray). In the author’s experience inherently pure violet (V) diamonds are exceptionally rare in nature, literally nonexistent. Thus, a collector is more apt to encounter violet when it appears as an apparent colour modifier such as violetish gray (v-GY) or violet-gray (V-GY). If nature did provide a bona fide (i.e., inherent) violet (variety) diamond, it would most probably occur in a diamond with a high hydrogen content, which theoretically could induce an unusually strong absorption band at 550 nm with a side band at 590 nm resulting in a complimentary violet body colour.