Growth marks on rough diamonds are associated with which feature?

Growth marks on rough diamonds are associated with which feature?

• A. Cleavage planes
• B. Growth marks
• C. Habit lines
• D. Luster patterns

Answer: (B)

Growth marks are formed during crystal growth as layers are added, showing fine lines or terraces on the rough diamond. They reveal the crystal’s development history—the incremental steps as the diamond built up—rather than how the stone might fracture, its overall shape, or its surface reflectivity. Cleavage planes describe where a mineral tends to split, habit lines reflect the typical external shape of the crystal, and luster patterns relate to how light interacts with the surface. Since growth marks directly trace the growth process, they’re the best association for rough diamonds.

Growth marks are formed during crystal growth as layers are added, showing fine lines or terraces on the rough diamond. They reveal the crystal’s development history—the incremental steps as the diamond built up—rather than how the stone might fracture, its overall shape, or its surface reflectivity. Cleavage planes describe where a mineral tends to split, habit lines reflect the typical external shape of the crystal, and luster patterns relate to how light interacts with the surface. Since growth marks directly trace the growth process, they’re the best association for rough diamonds.