Look at these beautiful trigons on the surface of these rough diamonds!
These are growth marks which are surface features that reflect a crystal’s development.
Many growth marks are unique to certain crystal faces. For instance, TRIGONS - little triangular depressions- occur on octahedral faces. They point in the opposite direction from the point of the crystal’s triangular face.
Growth marks are IMPORTANT for two reasons:
1-They help to separate diamonds from simulants (fake ones).
2-They help cutters determine cutting directions.