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According to the Gemological Institute of America, from Wikipedia, below:

"Included category (I) diamonds have obvious inclusions that are clearly visible to a trained grader under 10x magnification. Included diamonds have inclusions that are usually visible without magnification or have inclusions that threaten the durability of the stone."

A gem rated with I-1 clarity indicates that a single inclusion is visible. This is the highest rating for the included category, which is the lowest rating for diamond clarity.

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