Topaz is a precious gemstone that comes in a variety of colors including blue, yellow, pink, purple, and orange. It is a silicate mineral composed of aluminum and fluorine.

Blue topaz is the most commonly known and used in jewelry. It is often heat-treated to enhance its color and clarity. Natural blue topaz is rare, and most of the blue topaz found in the market is the result of heat treatment of colorless or pale yellow topaz.

Yellow topaz is also known as imperial topaz and is a highly sought-after gemstone. It ranges in color from golden yellow to orange-yellow and is often used in high-end jewelry.