Topaz gemstone is a substitute stone of diamond. Topaz gemstone is a birthstone for the person who born in October month. Topaz is a hard and durable gemstone, and will not dissolve in most chemical solvents. Topaz is a fairly common and inexpensive gemstone. Topaz actually has a wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Value increases with a deepness of color in orange and reddish hues. The most commonly used colors of Topaz in jewelry are the blue types.