The clarity of the loose diamond is determined by the brightness and the location of both the external and the internal characteristics. Most diamonds contain “inclusions”. Minute fractures within the stone may also be present. Once again, these are all part of the internal characteristics of the stone. It should be remembered that each stone is unique and this is why the internal characteristics of each stone vary.
The following characteristics are determining factors for clarity grading:
How quickly inclusions can be detected and whether they can be seen with the naked eye or with:
Appearance of inclusions
Nature of inclusions
Position of inclusions
Type of inclusions
A diamond is described as loupe clean when it is examined by an expert with a 10x binocular microscope magnification and found to be absolutely transparent and free from inclusions.
Very, Very Small inclusions in a diamond attract a VVS1 or a VVS2 clarity grade. These terms describe a diamond that when viewed through a 10x magnification loupe are very difficult to see.
Very Small inclusions in a diamond attract a VS1 or a VS2 clarity grade. These terms describe a diamond that when viewed by an expert using 10x magnification, they can discern very small inclusions which are difficult to see.
Small Inclusions in a diamond attract a SI1 or SI2 clarity grade. These terms describe a diamond that has inclusions that are relatively easy to find under 10x magnification. It is rare, but in a very few cases the includions in an SI2 diamond may be visible to the naked eye.
The clarity grade P1-P3 or I1-I3, refers to cut diamonds which when viewed with 10x magnification, are obvious and visible to the naked eye. These inclusions are not a hindrance to the brilliance of the diamond.