Colored gemstones are natural minerals that are prized for their beauty and rarity. Unlike diamonds, which are typically colorless, these stones come in a variety of hues, including red, blue, green, and yellow. Popular examples include sapphires, emeralds, and rubies. Their colors are often enhanced by factors such as impurities and the stone's crystal structure. These gemstones are used in jewelry and can also be collected as investments. The value of a colored gemstone is determined by its color, clarity, cut, and carat weight. Some gemstones, like tanzanite and alexandrite, are particularly sought after due to their unique colors and characteristics.