In gemstone grading, what is a critical factor affecting value?

The presence of inclusions and the overall clarity of a gemstone are crucial factors in determining its value. Clarity refers to the absence of internal or external flaws, which can significantly affect the aesthetic appeal and market value of the stone. Inclusions can hinder light passage through the gem, impacting its brilliance and sparkle. A stone with fewer inclusions is generally more desirable because it allows for better light performance and overall visual appeal. Thus, clarity is a vital aspect in gemstone grading, as higher clarity usually correlates with higher value.

While other factors like size, origin, and cut also play important roles in gemstone valuation, the presence of inclusions and clarity are often more directly tied to how the stone looks and performs in terms of light interaction. This makes clarity a fundamentally critical element in assessing a gemstone's worth.