Eye-clean
eye·clean | ˈī-klēn
adjective
A term used to describe gemstones containing flaws that cannot be seen without a 10x loupe
An eye-clean gem is one for which the inclusions cannot be seen with the naked eye. There is no official standard by which this is measured as the “human eye” is a subjective measurement, but it is generally agreed that for a gem to be eye-clean, these inclusions cannot be seen by someone with 20/20 vision from 6-12 inches away. While gems rated VS1 or likely to be eye-clean, gems rated VS2, SI1, or SI2 may be closer to this definition. For slightly included diamonds, for example, it’s recommended that you view magnified photographs before purchasing to determine what can be seen.