Colorless topaz is plentiful, and is often treated to give it a blue color. The color varieties are often identified simply by hue name—blue topaz, pink topaz, and so forth—but there are also a couple ...
For example, a 50-point diamond weighs 0.50 carats. But two diamonds of equal weight can have very different values depending on the other members of the Four C’s: clarity, color and cut. The majority ...