Diamond clarity characteristics are internal inclusions or surface-reaching blemishes that gemologists observe when assigning a clarity grade. Names such as crystal, feather, cloud, pinpoint, and needle describe what a feature looks like or how it formed; the name alone does not determine whether it is visible, concerning, or important to the buyer.
INCLUSIONS AND BLEMISHES ARE NOT THE SAME
Inclusions are internal features or features that extend into the diamond. Blemishes are confined mainly to the surface. Both can influence clarity grading. Most are tiny and require magnification to see, and many have no effect on normal enjoyment of the jewelry.
A grading laboratory evaluates clarity under controlled conditions. The final grade summarizes the overall effect of all relevant features. It does not mean every diamond within that grade will look the same.
THE FIVE FACTORS BEHIND A CLARITY GRADE
| Factor | What it means for a shopper |
| Size | Larger features are generally easier to see than very small ones |
| Number | Several tiny features may matter less or more than one feature depending on the total effect |
| Position | A feature under the table may be easier to see than one near the edge |
| Relief | High-contrast features stand out more than low-contrast features |
| Nature | The type and structure of the feature help describe its appearance and relevance |
COMMON INTERNAL CLARITY CHARACTERISTICS
Crystal: A crystal is a mineral crystal enclosed within the diamond. It may appear colorless, dark, or colored depending on its material and lighting. A tiny crystal near the edge can be difficult to find; a dark crystal beneath the table may be visible more readily.
Feather: A feather is a break within the diamond that can appear white, transparent, or reflective. Its importance depends on size, position, orientation, and whether it reaches the surface. Some feathers are minute and visually insignificant. Any feature near an edge or corner deserves thoughtful review with the setting design.
Cloud: A cloud is a grouping of very small pinpoints that may be difficult to distinguish individually. A small cloud can have little visible effect. A widespread cloud may reduce transparency in some diamonds. The report comments and actual appearance matter more than the word itself.
Pinpoint and Needle: A pinpoint is a minute crystal that looks like a dot under magnification. A needle is a slender crystal. They can be isolated or appear as part of a group. Visibility depends heavily on contrast and location.
Twinning Wisp and Internal Graining: A twinning wisp is a growth-related series of features that may include pinpoints, clouds, or crystals. Internal graining refers to growth patterns within the diamond. These can range from difficult to see to more apparent, depending on their extent and relief.
HOW TO READ A CLARITY PLOT
A clarity plot is a map of characteristics seen from the crown and pavilion. Symbols and colors distinguish types of features and whether they are internal or surface-related. The plot supports the grade and can also help identify the diamond, but it is not always a scale drawing of apparent severity.
- Check the key to symbols rather than guessing what a mark represents.
- Note whether the characteristic lies under the table, near a corner, or close to the girdle.
- Read comments because some features may be mentioned rather than fully plotted.
- Remember that a plot is a map, not a photograph of how visible the feature appears to the eye.
WHAT DOES EYE-CLEAN MEAN?
Eye-clean is a trade description, not a universal laboratory grade. It usually means the seller or viewer cannot see inclusions without magnification under specified conditions. The viewing distance, lighting, eyesight, and whether the diamond is loose or set can change the answer.
Ask for a precise definition: face-up only or from all directions, at what distance, and under what lighting? A diamond may be eye-clean face-up while a feature is visible from the side. Decide which view matters for the selected setting.
POSITION CAN MATTER MORE THAN THE INCLUSION NAME
A feature near the center may be easier to locate, while one near the edge may be concealed by a prong. However, hiding a feature should never compromise safe setting. Pointed shapes and clipped corners require careful coordination between the diamond's plot and the mounting.
Step-cut facet patterns may reveal characteristics more readily because their reflections are broad and open. Brilliant-style patterns can create more visual activity. This is why the same clarity grade should be judged in the actual stone, not selected only from a spreadsheet.
QUESTIONS TO ASK BEFORE SELECTING A DIAMOND
- Which characteristic sets the clarity grade?
- Can it be seen face-up without magnification?
- Is it reflected multiple times by the facet pattern?
- Does it reach the surface or sit near a vulnerable corner?
- Will the proposed setting protect the stone without placing pressure on the feature?
- Do video and in-person views agree with the report description?
When comparing diamonds through Neptunes Jewelry, use the report as a starting point and ask to discuss the actual location and visibility of the grade-setting characteristics. The goal is not to find a diamond with no natural features at any cost, but to choose one whose appearance and structure fit your priorities.
FAQ
1. Is a feather always dangerous?
- No. Feathers vary greatly. Size, location, orientation, surface reach, and the intended setting determine whether additional review is appropriate.
2. Are dark crystals worse than white inclusions?
- Dark features may have higher visual contrast, but location and size are also important. Compare the actual diamond.
3. Does a clarity plot show every inclusion?
- Not always. The plot records grade-relevant characteristics, and additional features may appear in comments or may not require individual plotting.
4. Is a VS diamond always eye-clean?
- Many are, but eye-clean is not guaranteed by a grade alone. Viewing conditions, diamond size, shape, and inclusion position matter.