Which clarity type typically features gems that are usually eye-clean?

Type I clarity typically refers to gems that are inherently less included than those of other types, meaning they are generally eye-clean. This classification often includes gemstones such as diamonds, which can be found with very few inclusions visible even under magnification. When it comes to the visual appearance of these stones, most Type I gemstones will not show inclusions to an observer's naked eye, making them particularly desirable in the market.

In contrast, the other types can contain more visible inclusions. For instance, Type II stones might have minor inclusions that could be seen with the naked eye under certain conditions, while Type III gemstones often exhibit more prominent inclusions. Type IV, while less common, tends to also have visible inclusions. Therefore, it is the characteristics of Type I clarity that make it synonymous with eye-clean appearance, explaining why it is recognized for featuring gems that usually appear clean without magnification.