Topaz is the birthstone for November and blue topaz the anniversary gemstone for the 4th year of marriage. Due to its clarity, durability and affordability, blue topaz has become one of the most popular gemstones on the market today. Imperial topaz is the anniversary gemstone for 23rd year of marriage. Click here to read full article. https://www.gemtraininginternational.com/wp-content/uploads/2021/11/Topaz-November-birthstone.pdf