A diamond has a large feather inclusion that extends from near the girdle toward the center under 10x magnification. What is the primary grading concern with this inclusion?
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A
It only affects color grade, not clarity
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B
It poses a durability risk in addition to affecting clarity grade
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C
Feathers at the girdle are always graded as external blemishes
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D
It automatically qualifies the stone as I1 clarity