What does "parting" indicate in gemstone characteristics?

Parting refers specifically to a characteristic of certain gemstones where there is a tendency to break along specific crystallographic planes. This is primarily due to the internal structure of the crystal, which is influenced by the arrangement of its atoms. When pressure is applied, gemstones may break cleanly along these planes, resulting in a flat surface. This phenomenon can be particularly noted in minerals like mica or certain varieties of feldspar, where the cleavage—an expression of parting—allows for predictable patterns of breakage.

Parting is distinct from other gemstone characteristics such as sharp edges, cutting styles, or enhancement techniques, which focus on different aspects of the appearance or treatment of the stone. Understanding the concept of parting expands the knowledge of crystal behavior and enhances gem identification skills.