Flawless (FL)
This is the highest grade of gem stone, where no internal inclusions or surface imperfections are visible under ten power magnification.
Internally Flawless (IF)
This describes stones with no visible interior imperfection but having minor surface blemishes which do show under magnification. This is the top jewelry stone.
Very Very Slight Imperfection (VVS1 VVS2)
This category rates stones that have tiny inclusions which are difficult to detect even with ten power magnification. These tend to appear "perfect" to all but the most trained professionals, and then only under optimal viewing conditions!
Very Slight Imperfection (VS1 VS2)
This indicates very slight imperfections which are still difficult to see with ten power magnification. This grade of stones appears to all but the trained eye as perfectly clear. This is where the "values" begin! The upper grades (FL thru VVS2) are great, but the cost is restrictive. When you can't see the difference, our advice is to consider this grade and save money!
Slightly Included (SI1 SI2)
These diamonds have slight imperfections and inclusions visible under ten power magnification. They represent one of the best values for a nice diamond. The stone will look great, but you don't pay for the additional laboratory-only clarity which makes little actual difference in the appearance and beauty of the stone. Sharp eyed individuals can sometimes spot an inclusion without magnification in SI2 stones.
Imperfect (I1 I2 I3)
These grades are where the vast majority of "jewelry store" diamonds are found. I1 stones are often reasonably priced and a great value. Most people can see I class inclusions without magnification.
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