What statement correctly describes the relationship between diamond color and its crystal lattice?

• A. Diamond color is primarily caused by defects in the crystal lattice.
• B. Diamond color is primarily caused by the diamond's cut.
• C. Diamond color is essentially colorless regardless of lattice.
• D. Diamond color is determined exclusively by surface coatings.

Answer: (A)

Color in diamond comes from what sits inside the crystal lattice. A perfect diamond lattice would be essentially colorless because it absorbs very little light. Real diamonds, however, contain trace impurities and lattice defects that create color centers. These imperfections change how light is absorbed, so the light that passes through or reflects back to your eye has a characteristic color. For example, nitrogen impurities in the lattice can produce yellow to brown hues, boron impurities can give blue tones, and radiation-induced defects can lead to greens or grays. The cut or surface coatings can influence appearance, but the intrinsic color of a diamond is driven by impurities and defects within the lattice, not the cut or surface treatment.