The clarity of a diamond refers to the amount of its visible internal and external flaws, or inclusions, which may adversely affect the amount of light that passes through the gemstone. It is exceptionally rare to find an absolutely flawless diamond, and thus a diamond’s value rises with fewer inclusions found within. Common inclusions range from slight scratches visibly obvious on the diamond, to a tiny internal build up of minerals and crystals that can occur when the diamond is formed. The various clarity ratings for a diamond are as follows: Rare Diamonds – FL (Flawless), IF (Internally Flawless) – As mentioned above, a flawless diamond is very rare to come across. Even under a 10x magnification they contain absolutely no physical flaws whatsoever. They are incredibly beautiful diamonds with a noticeably vibrant shine. Uncommon Diamonds – VVS1 & 2 (Very, Very Slightly Included) – These diamonds have exceedingly faint inclusions that are quite difficult to identify even with magnification. VS1 & 2 (Very Slightly Included) – These inclusions would still be relatively tough to spot despite magnification. Common Diamonds – S1 & 2 (Slightly Included) – The minor flaws contained within are obvious once the diamond is placed under magnification, however they are still inevident to the naked eye. Undesirable Diamonds – I1-3 (Included) – The diamond will have flaws that are very obvious to the naked eye, which significantly detract from the aesthetic appeal of the Gemstone.