Which category of gems includes aquamarine and yellow beryl as typically eye-clean?

The correct category of gems that includes aquamarine and yellow beryl as typically eye-clean is Type I. Type I gemstones are characterized by their clean appearance, meaning they generally have very few inclusions visible to the naked eye. This category includes stones that are commonly found in a clear, transparent form, which allows for a higher level of clarity.

Aquamarine, a member of the beryl family, is known for its beautiful blue color and is typically considered a Type I gem due to its eye-clean quality when mined. Similarly, yellow beryl, also part of the beryl family, usually has a high degree of clarity, often appearing without visible inclusions.

In contrast, Type II gemstones can contain some inclusions but are usually not enough to significantly affect their overall appearance, while Type III gemstones are typically characterized by numerous inclusions and are usually not eye-clean. Type IV stones are often opaque or have significant flaws that impact their clarity. Understanding these classifications helps in the evaluation and grading of colored gemstones.