Gemstone Color Guide

Learn how to evaluate gemstone color objectively and understand lighting effects, zoning, and trade terms.

Gemstone color guide

A deep dive into hue, tone, saturation, and the phenomena that create spectacular gemstone colors.

The Three Dimensions of Color

Understand Hue (the basic impression of color), Tone (how light or dark the color is), and Saturation (the intensity or purity of the hue).

Adjust sliders for hue, tone, and saturation, and simulate the effects of daylight, incandescent, and fluorescent lighting on perceived color.

Learn about pleochroism, color change (the Alexandrite effect), fluorescence, and how to use a neutral viewing protocol when buying online.