Which property of chrysoprase defines its appearance?

Chrysoprase is primarily defined by its striking color, which is typically a vibrant green. The property of color saturation plays a crucial role in its appearance, as the intensity and purity of the green hue can significantly impact its desirability and value. High-quality chrysoprase exhibits a rich, uniform color that captures light beautifully, enhancing its aesthetic appeal.

While clarity, size, and origin can influence certain qualities of gemstones, they are not as definitive in establishing the overall appearance of chrysoprase. Clarity refers to the absence of inclusions, size can affect the gemstone’s usability but not its primary visual characteristics, and origin might speak to the stone’s provenance but does not impact its actual visual impression as directly as color saturation does. Therefore, the defining property of chrysoprase's appearance is indeed its color saturation.