In which clarity grades do definitions typically vary for each clarity type?

The clarity grade "eye-clean" is significant because it refers to how a gemstone appears to an observer without magnification. In this context, "eye-clean" indicates that any inclusions or blemishes present within the stone are not visible to the naked eye. The interpretation of what qualifies as eye-clean can vary quite a bit depending on the type of gemstone in question; for instance, certain gemstones may have different thresholds for what is considered acceptable for eye-clean status based on their refractive index and typical inclusions.

In contrast, the other clarity grades mentioned—VVS (Very Very Slightly Included), Included, and Flawless—tend to have more standardized definitions across different types of colored stones. VVS refers to stones with very minor inclusions that are difficult to locate even under magnification. Included stones have visible inclusions that impact clarity, while flawless stones exhibit no inclusions or blemishes even under 10x magnification. These definitions have a more universal understanding and application regardless of the specific gemstone type, making eye-clean the clarity grade where variation typically occurs.