However, Topaz in blue is the most appreciated in the Topaz family for Swiss blue topaz designer Jewelry due to its gleaming luster and striking play of colors. Although many gems are available in the blue color range, such as Sapphires, Tanzanite, Lapis Lazuli, Aquamarine, Kyanite, etc., many are not ideal to wear every day. This alluring blue stone sits on a position of 8 on the hardness scale, means you can wear your Swiss Blue Topaz Jewelry every day.