Colorless topaz is often irradiated and heat treated to form Blue Topaz. Silver Topaz is also called "Blue Topaz". Topaz makes an ideal gem. ... The most valuable colors of Blue Topaz are the golden Orange-Blue type, called Imperial Topaz, and the dark pinkish-red and orange-red colors.

Often associated with loyalty and love, this gem represents eternal romance and friendship. Blue topaz symbolizes honesty, clarity of feelings, and deep emotional attachment. Gifts of topaz jewelry and gems may signal a wish for a committed romantic relationship or a strong appreciation of loyal friendship.