Learn how cut, carat, color and clarity impact on a diamond's overall appearance.
The FLAWLESS GRADE (FL) is used to describe diamonds in which a skilled observer (a gemologist), under favorable lighting conditions, cannot see any inclusions with a binocular microscope at ten power magnification or with a 10x corrected loupe. Small extra facets on the pavilion near the girdle, not visible when viewed from above, are permitted as are small naturals when they are confined to the girdle and do not flatten the girdle outline. Internal graining is permitted provided it does not draw any color or texture and is not observed through the crown (face up).
The INTERNALLY FLAWLESS GRADE (IF) describes diamonds which have no internal characteristics observable under the the same conditions as (FL) described above, but which have minor surface blemishes that do not penetrate the stone.
The VVS1 & VVS2 GRADES(VERY, VERY SLIGHTLY INCLUDED) are used to describe diamonds which have very, very small inclusions which are difficult for a skilled observer (a gemologist) to see under the conditions using a binocular microscope at ten power magnification or with a 10x corrected loupe. Colored or textured graining is permitted, provided it is not observable through the crown (face up).
The VS1 & VS2 GRADES (VERY SLIGHTLY INCLUDED) are used to describe those stones with very small inclusions which can be difficult to observe under the conditions of 10x magnification. Except for larger stones or occasionally with Emerald Cut diamonds, these are rarely visible to the unaided eye.
The SI1 & SI2 GRADES (SLIGHTLY INCLUDED) are used to describe stones with small inclusions which are usually obvious when viewed under the conditions of 10x magnification by a skilled observer (a gemologist). Stones in these grades may sometimes have inclusions which are difficult to see with the unaided eye (large stones & Emerald Cut diamonds mostly).
The I1, I2, & I3 GRADES (IMPERFECT) are used to describe stones with medium to large inclusions (Piques) which are usually obvious to a skilled observer (a gemologist) with the unaided eye. An I1 may have an inclusion located to the side while an I2 will have it centrally located or numerous inclusions.