F (Flawless): No internal or external flaws. Extremely rare, these diamonds come with a price tag to match their rarity. These are the most expensive.
IF (Internally Flawless): no internal flaws, but some surface flaws. Rare, but prices are not as high and are usually a quality range that is most preferred.
VVS1-VVS2 (Very Very Slightly Included 1 and 2): Minute inclusions very difficult to detect under 10x magnification by a trained gemologist. Easy to find in a wide range of prices.
VS1-VS2 (Very Slightly Included 1 and 2): Minute inclusions seen only with difficulty under 10x magnification. Easy to find in a wide range of prices.
SI1-SI2 (Slightly Included 1 and 2): Minute inclusions are visible under 10x magnification, and may be visible by the unaided eye. Easy to find in a wide range of prices.
I1-I2-I3 (Included 1, 2, and 3): Inclusions visible under 10x magnification as well as to the human eye. These flaws may negatively impact the transparency and or brilliance of the diamond and are not considered in the recommended list to buy.
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