Dark-appearing cloud inclusion in an SI2 diamond

This 1.01 carat F color SI2 diamond is an unusual case. Instead of the typical milky haze, the cloud inclusion shows up as a noticeably dark patch under the table. Why does that happen? The pinpoints are tightly packed in a small area, creating a concentrated zone that blocks more light. Although it is still classified as a cloud, its visual effect feels closer to a dark crystal, especially under bright lighting.

These dense, shadow-casting clouds are rare but they do occur in lower clarity diamonds. This is a perfect example of why a GIA plot does not tell the full story. Two diamonds might both be labeled as having clouds, but only a real image will show which one affects brilliance and which one quietly fades into the background.than relying solely on the clarity plot.