What are IF and FL diamonds?

FL diamonds stand for Flawless and this is when the diamonds possess neither external or internal blemishes. However, it is not 100% pure as it still contains inclusions which can be seen under 60x or 100x magnification. As for IF diamonds, it stands for Internally Flawless. These diamonds have no internal blemishes but might have some on its surface. The diamonds are extremely rare which makes it exceptionally expensive.