Gem-quality diamonds are the highest grade of diamonds, valued for their exceptional clarity, color, cut, and carat weight. These factors are often referred to as the "Four Cs." A gem-quality diamond typically has minimal inclusions and blemishes, making it visually stunning and suitable for fine jewelry. The most sought-after diamonds are colorless or near-colorless, although some colored diamonds, like blue diamonds or pink diamonds, can also be considered gem-quality. The cut of a diamond affects its brilliance and sparkle, with well-cut diamonds reflecting light beautifully. Gem-quality diamonds are often used in engagement rings and other luxury items.