Inclusions are foreign material trapped in the diamond crystal during its growth. They can vary by type and amount, by location, and distribution by the crystal. Inclusions can be either metallic or nonmetallic. They affect the performance of a diamond product by influencing how the crystal breaks down.
The cutting process is dynamic. The crystal loading fluctuates significantly from high energy impact to a varying continuous load even within a single cut. Severity of the cutting application determines the amount and type of loading on the crystal. The inclusions within the crystal are an important factor in determining how the crystal withstands the loading.