Diamond blemishes are external flaws found on the surface of a diamond. Unlike diamond inclusions, which are internal imperfections, blemishes typically result from the cutting process, wear and tear, or handling. While they don’t always impact the diamond’s overall beauty, they can affect its clarity grade and durability. Here are the most common types of diamond blemishes:
1. Scratches
Scratches are fine, shallow lines that appear on a diamond’s surface. They are often caused by contact with other diamonds during wear or handling. Although they are usually not visible to the naked eye, scratches can affect the diamond’s brilliance by disrupting how light reflects off the stone’s surface.
2. Nicks
Nicks are small chips or cuts typically found along the girdle or edges of the diamond. These minor breaks are the result of accidental impacts, such as hitting the diamond against a hard surface. Nicks are more common in diamonds with pointed edges, like princess or marquise cuts, and should be monitored to prevent further damage.
3. Polish Lines
Polish lines are faint streaks or grooves left behind on a diamond during the polishing process. These lines may not always be visible to the naked eye but can be seen under magnification. Although polish lines generally don’t impact the structural integrity of the diamond, they can influence how light interacts with the stone, slightly diminishing its brilliance.
4. Pits
Pits are tiny indentations or holes that appear on the diamond’s surface. They can occur naturally or during the cutting and polishing process. While one or two small pits are generally not a cause for concern, multiple pits, especially in highly visible areas, may affect the diamond’s overall appearance.
5. Chips
Chips are larger, visible breaks or missing pieces on the diamond’s surface, usually near the girdle or on sharp edges. Chips are caused by hard impacts and can pose a risk to the diamond’s structure, especially if they are in critical areas. They often require professional repair or recutting.
6. Abrasion
Abrasion refers to small worn-down areas or dull spots along the diamond’s facet edges. This usually happens when diamonds rub against other diamonds or hard materials over time. While abrasion typically occurs in older diamonds, it can also happen with poor handling. These worn areas can reduce a diamond’s sharpness and brilliance.
7. Extra Facets
Extra facets are additional, unplanned facets cut into the diamond to remove imperfections or blemishes. These extra facets do not align with the diamond’s overall symmetry and can alter the way light reflects from the stone. Though minor extra facets may go unnoticed, larger or multiple facets can affect the diamond’s appearance.
Understanding these surface-level blemishes can help you evaluate a diamond’s overall quality. While minor blemishes, such as polish lines or tiny pits, often have little impact on appearance, larger flaws like chips and nicks can compromise both beauty and durability. Always consult a grading report and have the diamond inspected by a professional to ensure its long-term brilliance and integrity.
