Their high value comes from their scarcity due to ... For non-blue stones, the color is included in the name, such as the yellow sapphire. Sapphires are mined in many countries around the world.

In general, the more intense and uniform the color is, the more valuable the stone. Sapphires that are not blue are known as fancy sapphires, and may be any color—except red (which is a ruby). The ...

Figure 1. This 4.27 ct sapphire was filled with orangy yellow lead glass throughout the stone. Photo by Gagan Choudhary; courtesy of Dheeraj Gupta. This contributor has previously reported ...