Total “pure” diamonds are extremely rare naturally. A diamond may hide some crystallizations inside, known as inclusions. During the clarity test of a diamond, it is necessary to evaluate the number of the inclusions, their nature and position. The inclusions can be formed when the diamond comes into contact with other substances or when goes through variations of temeperature or pressure, during its growing in the Earth’s crust. The inclusions have been classified as: “FL-IF”, “VVS”, “VS”, “SI” and “I”.
- IF (internal flawless): This category indicates that the stone has no inclusions;
- VVS (Very Very Small Inclusion): In this case, the stone presents very very small inclusions that can barely be seen under a magnifying glass x10;
- VS (Very Small Inclusion): In this case, the stone presents very small inclusions that can unlikely be seen under a magnifying glass x10;
- SI (Small Inclusion): This is a lower category because the inclusions can be easily seen under a magnifying glass x10;
- I (Included): Included 1- The inclusions will be visible to the naked eye. Included 2 – There will be many and big inclusions, clearly visible to the naked eye. Included 3 – There will be many and big inclusions that seriously affect the brightness of the stone.