Color creates the first emotional response to most gemstones. Clarity reveals how the stone formed—and how safely it can be worn, set, or recut.
The three dimensions of color
Hue is the basic color impression, such as green, blue, or violet. Tone describes lightness or darkness. Saturation measures the strength or purity of the color.
The best combination depends on variety. An emerald and an aquamarine should not be judged against the same saturation target.
Clarity is variety-specific
Some gemstones commonly form with visible inclusions; others are expected to be relatively clean. Emerald’s inclusions may be accepted as part of its character, while similar inclusions could sharply affect value in aquamarine.
Inclusions can also provide evidence of natural formation or origin, but only trained analysis should support definitive claims.
Evaluate the whole stone
Look for even color distribution, distracting extinction, windowing, color zoning, surface-reaching fractures, and inclusions that affect durability.
Request neutral-light images, video, dimensions, and disclosure of any photography adjustments. Screen settings can materially change perceived color.
Key takeaways
- ◆ Judge color by hue, tone, and saturation.
- ◆ Clarity expectations vary by gemstone.
- ◆ Inclusions can affect beauty and durability differently.
- ◆ Neutral-light media improves online evaluation.