A fancy color diamond is a type of diamond that exhibits a noticeable color, unlike traditional diamonds that are typically colorless. These diamonds can come in a variety of colors, including yellow, blue, pink, and green, and their value is determined by the intensity and purity of the color. The grading system for fancy color diamonds is different from that of colorless diamonds, focusing on hue, tone, and saturation. The unique colors in fancy color diamonds are caused by various factors, such as the presence of certain elements during their formation. For example, nitrogen can create yellow diamonds, while boron can lead to blue diamonds. Due to their rarity and beauty, fancy color diamonds are highly sought after in the jewelry market.