The Whiteflash baseline definition of eye-clean is:
No inclusions visible to the naked eye of a person with 20/20 vision when viewing the diamond in the face-up position at a distance of approximately 10 inches under normal overhead lighting .
Distance, lighting and human vision all influence this judgment. There is no universally agreed upon definition of eye-clean in the trade so we developed this one in order to communicate meaningfully with our customers. 10 inches is the ‘distance of most distinct vision’ as defined by the field of optometry. It is also a basis used by the AGS Laboratory in light performance grading, and so this is a logical standard and a practical baseline.
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