One of the very gorgeous gemstone is Yellow Topaz, the birthstone for November. The name "topaz" is derived from the Greek word "Topazos". Topazos means any stone that is of the color yellow.
The name is derived from the color - the yellow of the lemon, although the most sought-after stones have a clear, radiant yellowish to brownish red. Like all crystal quartzes, the citrine has a hardness of 7 on the Mohs scale and is thus, to a large extent, insensitive to scratches.