Diamond Inclusions Explained with Real Images

Inclusions are internal or surface-reaching clarity characteristics. Blemishes are confined to the surface. Together, they contribute to clarity assessment. GIA’s diamond clarity guidance explains that grading considers characteristics under 10× magnification, using factors including number, size, relief, nature and position. Relief means the contrast between a characteristic and its surroundings.

The word “inclusion” describes a category, rather than a single level of seriousness. It does not automatically mean that a diamond looks marked, has poor transparency or needs repair. Equally, a reassuring description such as “just a feather” does not establish whether a particular break requires closer assessment.

Separate three questions when evaluating a candidate: can you see the characteristic under the viewing conditions that matter to you; does it affect the diamond’s transparency or appearance; and does its nature or position raise a condition or setting concern? Request an answer to each rather than treating “eye-clean” as a complete assessment.

The descriptions below follow GIA’s inclusion terminology. They are identification starting points, not diagnoses from a photograph. Similar-looking features can require different lighting and magnification to distinguish.

Avoid a universal “best to worst inclusions” list. The feature’s name alone leaves out too much information. A shortlist entry should connect the term with its position, observed visibility and any issue requiring professional review.

These terms describe different forms of enclosed crystal features. IGI’s glossary defines a crystal as mineral material trapped inside a diamond. Do not identify its composition solely because it appears dark in a video. “Black spot” is a visual observation; it is not a reliable mineral identification.

When reviewing a dark feature, ask the supplier to point it out in a paused frame and then rotate the diamond slowly. Record whether you notice it from the normal top view, only at particular angles or only after enlarging the image. Keep the original recording alongside the marked frame so that an annotation does not become your only evidence.

If the listing uses a broad label such as “crystal”, ask which feature it refers to. An answer that identifies the location and relevant report entry is more useful than “normal for this clarity”. You are comparing a specific stone, so the explanation should be specific too.

A cloud does not automatically mean the entire diamond looks cloudy. GIA’s research on inclusion-related appearance discusses how cloud density and distribution can differ. A localised grouping and widespread dense inclusions should not be treated as the same visual situation.

Ask whether the actual diamond has reduced transparency under suitable examination. A bright video is useful for appearance, but it should not replace a clear answer about the characteristic. If the supplier cannot explain what a report comment means for the stone, request a gemologist’s assessment before proceeding.

Twinning wisps and graining also need context. Request a view that shows the relevant feature, together with an explanation of whether the concern is visibility, transparency or simply a documented characteristic. Do not infer a future crack from a growth-related line without an appropriate examination.

View the real feather photomicrograph, documented in GIA’s “Distinctive Feather in Diamond”.

The photograph shows an irregular, reflective feature stretching across the central part of the view. GIA identified it as a grade-setting feather in a 0.30 ct, D-colour diamond graded I1. It was most readily observed through the pavilion facets, rather than presented as an ordinary face-up view.

Image credit: Raju Jain; published by GIA in Gems & Gemology, Winter 2023. The reported field of view is approximately 3 mm.

This example teaches two useful habits: establish the viewing direction and keep the image attached to its documented specimen. The shape of this feather cannot tell you the clarity or durability of a different diamond with a vaguely similar line. Nor does the article provide a normal-distance wearing image of this specimen.

When a supplier sends a feather close-up, request its position in the full stone as well. A detailed crop without context leaves you unable to relate the feature to the table, girdle, corners or proposed setting.

View the real cloud photomicrographs, Figure 1 in GIA’s “Starburst Cloud Inclusions in Diamond”.

These two microscope views show unusual star-like groupings in a 2.50 ct diamond with a Faint yellow-green colour grade. The researchers observed patches near the girdle through the pavilion. This is a distinctive research specimen, rather than a representative image of every cloud found in a colourless diamond.

Image credit: Forozan Zandi; published by GIA in Gems & Gemology, Fall 2025. The left and right fields of view are 1.26 mm and 2.34 mm respectively.

The important lesson is that a cloud can contain structure that a simple plotting symbol cannot reproduce. These images do not establish that a diamond carrying the word “cloud” will look yellow-green, develop the same pattern or appear hazy in wear.

Use the photograph as an educational reference, then request evidence for your own candidate. Scientific identification of the pictured inclusions belongs to the documented examination, rather than to a visual comparison made from an unrelated sales image.

Clarity is not determined by counting dots alone. GIA’s quality-factor explanation describes the combined importance of size, number, position, nature and contrast. The same-sized characteristic can matter differently beneath the table than towards the side of a diamond.

For buying purposes, write down the feature that explains the reported assessment and what further observation you need. “Crystal beneath the table; normal-distance visibility to confirm” gives you a clear follow-up. “Three inclusions, therefore worse” does not account for how the stone was examined or what those characteristics are.

Do not assign a grade from a screen capture. GIA’s grading process involves controlled examination, systematic plotting where applicable and additional review. A video helps you assess appearance, but it is not a substitute for that laboratory process.

Keep clarity alongside the other purchasing factors. If you are choosing between a higher clarity label and another visible benefit, Uniglo’s diamond cut versus clarity guide explains how to compare those priorities.

“Eye-clean” generally concerns whether inclusions can be seen without magnification under stated conditions. It is not a separate laboratory clarity grade. IGI’s explanation of eye-clean assessment highlights the influence of eyesight, distance, lighting and viewing direction.

A close-up that fills your monitor answers a different question from looking at a ring on your hand. Do not reject a candidate solely because an inclusion is obvious in an enlarged frame, or accept it solely because a small compressed video conceals detail.

Request both a magnified recording and a face-up assessment at an agreed ordinary viewing distance. Ask whether the seller’s eye-clean statement covers only the top view or other directions too. If inspection is remote, obtain a written description and understand the inspection and return terms before committing.

Keep two notes in your comparison: “visible under magnification” and “visible without magnification under these conditions”. This helps you express what you actually want instead of treating the highest available clarity as the only acceptable result.

Some characteristics merit closer condition assessment, especially where a break or opening is relevant to an edge, point or setting location. IGI’s feather explanation distinguishes small, relatively benign examples from larger or differently positioned feathers that can present a concern. It also explains why setting pressure matters.

Ask a qualified examiner whether a characteristic reaches the surface, how far it extends and whether its position changes the setting plan. Request the assessment before the stone is mounted if a corner or edge is involved. A photograph alone does not establish the complete three-dimensional extent of a break.

Avoid blanket promises that all feathers are safe or that every feather will worsen. Equally, covering a feature with a prong is a design decision, not proof that the feature is suitable to sit beneath setting pressure. Ask the setter to consider the actual location and condition.

If information remains unclear, keep the candidate provisional or choose another well-documented option. There is little benefit in meeting a paper specification while leaving a material condition question unanswered.

A plotting diagram records selected clarity characteristics and their approximate locations. GIA’s plotting guide explains that most inclusions are marked in red; some surface-reaching features use red and green together. Read the actual key rather than assuming every colour means the same thing on every laboratory document.

The plot is not a photograph, and an empty-looking area does not prove that it contains no characteristics. Some widespread, faint or unnecessary-to-plot features may be addressed in comments. Read the diagram, key, comments and stated grade together.

For GIA reports with a key, characteristics are generally ordered by significance, with a disclosure exception for laser drill holes. Do not assume the first term always identifies the sole reason for the grade. Report formats can differ, and the absence of a plot is not evidence of an inclusion-free diamond.

For your shortlist, record the report number, relevant term and corresponding position in the supplied video. Uniglo’s diamond certificates guide can help you keep laboratory identification and report details organised.

Cutting style influences what you see. GIA’s clarity buying guidance explains that inclusions can be easier to observe through the open facets of an emerald cut than among a brilliant cut’s smaller facets. Facet reflections can also make a characteristic appear in more than one place.

Do not count every repeated mark in a rotating clip as a separate inclusion. Ask the supplier to distinguish the physical characteristic from its reflections. For a shape comparison, use Uniglo’s emerald versus radiant guide, then return to the report and actual appearance of each candidate.

Match the presentation conditions as closely as possible when comparing stones. Request similar video framing, lighting and movement, rather than judging one diamond from a sharp close-up and another from a distant promotional clip. This will not reproduce laboratory grading, but it makes your visual shortlist more useful.

Yes. Laboratory growth does not guarantee an inclusion-free diamond. IGI’s lab-grown inclusion guide documents both shared characteristics and features associated with different growth processes. Examples include metallic inclusions in some HPHT-grown diamonds and growth-related features in CVD-grown material.

Do not use a single black dot or feather in a photograph to decide whether a diamond is natural or lab-grown. GIA’s research chart on diamond inclusions explains that some specimens lack diagnostic microscopic features and require advanced testing for origin or treatment identification.

Establish origin from an appropriate laboratory document. Then review the individual stone’s characteristics and appearance using the same careful questions. Keep origin, clarity terminology and treatment information as separate entries in your buying brief.

Ordinary cleaning does not remove enclosed inclusions. A persistent internal mark needs identification rather than progressively harsher cleaning. GIA’s care guidance recommends caution with home ultrasonic and steam cleaning, which can create problems with settings.

Clarity treatments are a different matter. GIA’s treatment explanation describes laser drilling and fracture filling, which can alter the appearance of certain characteristics. Laser drilling leaves a clarity characteristic; fracture filling involves introduced material and is not considered a permanent, stable treatment. GIA does not issue grading reports for fracture-filled diamonds.

If a seller proposes “removing” a feature, ask what procedure is involved, what evidence and disclosure will follow, and what care requirements will apply. Do not authorise an intervention from a vague assurance that the stone will look better afterwards.

Send the supplier a short, specific brief rather than asking only for “good clarity”. The following requests connect the report with a practical buying decision:

• The complete laboratory report and identification of the significant clarity characteristics.
• A clear, slow magnified video showing those features in context.
• A stated face-up, unaided-eye visibility assessment with viewing conditions.
• Confirmation of whether transparency, surface condition or setting suitability needs further review.
• Treatment disclosure, inspection arrangements and applicable return terms.

If two candidates meet your appearance requirements, compare the complete specifications and current quotations. Do not invent a fixed discount for a crystal, cloud or feather. A useful comparison needs actual stones, actual evidence and an explanation of the differences you are paying for.

To discuss a shortlist, contact Uniglo Diamonds with the shape, budget, preferred origin and report details. Ask for comparable evidence of the particular diamonds being considered, rather than using a reference image as a substitute for their examination.

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