A diamond graded as Flawless may still have which of the following?

A diamond graded as Flawless, according to the GIA grading scale, is one that has no inclusions or blemishes visible at 10x magnification, which is a critical standard in gemology. However, the grading does not cover the complete absence of any modifications to the diamond structure, such as extra facets.

Extra facets can be present on the pavilion of a diamond, and while they may not be visible when viewed face up, they do not detract from the Clarity grade of Flawless since they are not inclusions or blemishes that are detected under 10x magnification. This means the diamond can maintain its classification as Flawless despite having these extra facets.

The other options involve features that would inherently conflict with a Flawless grading. For instance, surface blemishes and scratches would be visible under the specified magnification and would therefore prevent the diamond from achieving a Flawless grade. Similarly, minor inclusions seen under 10x magnification directly contradict the criteria required for a diamond to be ranked as Flawless.