Spinel

Known for stunning, saturated hues, tourmaline is a colorful and modern gemstone. Most tourmalines undergo heat and radiation treatments…

Rare chrome tourmaline can show an emerald-like green color. With a highly desired color and tourmaline’s excellent qualities as a jewelry…

The Usambara effect is the term applied to a type of color change in gemstones, first seen in tourmalines from the Umba Valley in Tanzania. However,…

How should novice faceters choose their first gemstones? Learn which gem rough materials combine cutting ease, low cost, good size, and profit…

Distinguishing between natural and synthetic gems is a critical skill for gemologists. Learn about gem making processes and the telltale signs…

Our indicolite buying guide can help you learn how these blue tourmalines are graded, what to avoid, and how to identify a high-quality stone.

Our rubellite buying guide can help you learn how rubellites are graded, what to avoid, and how to identify a high-quality stone or a bargain in the…

Rare chrome tourmaline can show an emerald-like green color. With a highly desired color and tourmaline’s excellent qualities as a jewelry stone,…

Looking for a tourmaline jewelry stone? If you like green and you’re on a budget, green tourmaline or verdelite is the gem for you.