Garnets do come in a pure red hue, but they are rare in sizes over a half carat. It is much more common to see garnets with a significant brown component to the red or a very dark tone that is ...

That is because rubies are one of the world’s four precious gemstones, which also include diamonds, emeralds, and sapphires. However, we are lucky to possess an abundance of semi-precious gemstones of ...

Figure 1. Color-change phenomenon was observed in this 2.11 ct octagonal mixed-cut spessartine. The left image, with a dark green color, was taken using an LED light source with 6500K color ...