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 ...

The stone’s CIE L*a*b* color coordinates are reproduced from the measured UV-visible spectrum. Natural sapphires with pale or lemon yellow color and no orange hue are traditionally associated with the ...

Blue sapphires are the most well-known but the stones can be found in almost any color in the rainbow, starting with pink, yellow, green, and white. This variety guarantees that there are sapphire ...