Canary yellow diamonds have a pure, intense yellow color, while fancy yellow diamonds have secondary hues of green, orange, or brown. The most valuable yellow diamonds are those with a pure, vivid yellow color and no secondary hues. The grading of yellow diamonds is based on the intensity of their color, ranging from faint yellow to fancy vivid yellow. The Gemological Institute of America (GIA) uses a scale of nine grades to describe the color of yellow diamonds, with fancy vivid yellow being the most valuable and rare. Yellow diamonds are prized for their vibrant color, rarity, and unique beauty.
