What term describes a thin, dull white line across the diamond's surface with no apparent depth at 10X?

What term describes a thin, dull white line across the diamond's surface with no apparent depth at 10X?

• A. Scintillation
• B. Scratch
• C. Rough Girdle
• D. Sawing

Answer: (B)

A thin, dull white line that runs across the diamond’s surface at 10X magnification is a surface blemish called a scratch. Scratches are superficial marks caused by contact or rubbing, so they appear as flat lines with no visible depth when you look closely. They don’t alter the shape of the surface like a groove would, and they’re not related to the diamond’s sparkle pattern (scintillation), the rough texture around the girdle (rough girdle), or tool-cut marks from sawing. So the description fits a scratch perfectly: a shallow, external line with no depth.

A thin, dull white line that runs across the diamond’s surface at 10X magnification is a surface blemish called a scratch. Scratches are superficial marks caused by contact or rubbing, so they appear as flat lines with no visible depth when you look closely. They don’t alter the shape of the surface like a groove would, and they’re not related to the diamond’s sparkle pattern (scintillation), the rough texture around the girdle (rough girdle), or tool-cut marks from sawing. So the description fits a scratch perfectly: a shallow, external line with no depth.