Complex sentence: Diamonds which are nearly round due to the stepping tendency of octahedrons are commonly coated in a gum-like skin ("nyf "); the combination of stepped faces, growth defects, and nyf produces a"scaly" or corrugated appearance.
Split into simpler sentences: Diamonds which are nearly round, due to the formation of multiple steps on octahedral faces, are commonly coated in a gum-like skin ("nyf "). The combination of stepped faces, growth defects, and nyf produces a"scaly" or corrugated appearance.