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Internal Graining in Diamonds: What Buyers Should Watch For
Aug 07, 2025

Internal Graining in Diamonds: What Buyers Should Watch For

Supriyo Khan-author-image Supriyo Khan
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While buying a diamond, most people pay attention to cut, carat, and color. However, the diamond’s clarity substantially contributes to the brilliance, beauty, and value—in this case, one feature of clarity that buyers must pay attention to is internal graining. Though it is seldom acknowledged, this internal feature may affect a diamond’s appearance as well as its price. Here’s a breakdown that covers all the essentials along with how Rare Carat ensures that buyers are well informed and confident.  


 1. What is internal graining ?


Internal Lines or streaks that form within a diamond due to irregular crystal growth. These lines may be faint and reflective or white or colored, and sometimes they are visible, while other times they require magnification to be seen.


Although not always harmful, noticeable internal graining might reduce a diamond’s clarity grade and dull a diamond’s scintillation, particularly lits located adjacent to the table facet.  


 2. Rare Carat Simplifies the Search for EyeClean Diamonds  


Many diamond buyers are unaware of how to interpret a diamond grading report. That is where Rare Carat stands out. Unlike customary retailers, Rare Carat utilizes AI-powered grading and price scoring to assess over a million diamonds from vetted suppliers, alerting users to possible clarity concerns, including internal graining.  


Rare Carat’s machine learning systems assist clients by providing valuable insights, rather than having users navigate through reports themselves, assessing value and concealment of inclusions.  


 3. Certified Gemologist Reviews—At No Extra Cost  


Rare Carat also helps buyers by not leaving them without guidance. After users curate a list of diamonds to purchase, the certified gemologists on the team carry out free reviews, providing objective advice on internal graining, crystals, and feathering.  


The reviews provide an added layer of confidence that the buyer is not gambling on high stakes guesswork for a purchase.


 4. Guarantees, Transparency, Shield, And Total Assurance


Rare Carat provides a 30day moneyback guarantee, free insured shipping and returns, and complimentary 1year resizing (except for eternity bands over 30 days). Additionally, they offer lifetime warranty options. This is especially important for buyers with diamonds that have minor inclusions like graining. 


Rare Carat’s unimpressive 4.9 🌟 rating on Trustpilot and Google Business suggests that thousands of customers do appreciate their transparent process. 


5. Not Every Internal Graining Is Seen


People often assume that internal graining diminishes a diamond’s beauty. In reality, many VS1 and VS2 diamonds have internal graining that is not visible. 


Reviews, especially ones accompanied by highquality images, are critical for online shopping. Rare Carat, for instance, ensures customers see expert reviews and images. While certificates serve as an important source of information, they do not always present the complete picture.


6. Placement of Graining Matters a Lot


While internal graining situated quite deep in the pavilion or near the girdle (the side edge of the diamond) is unlikely to diminish brilliance, graining positioned beneath the table, the largest and most visible facet, will certainly cause some degree of light return haziness or blur, thus impacting sparkle proficiency.


Always request a diamond’s video and magnified inspection. Many listings on Rare Carat come with these features which assist in appreciating the true value.


7. Grading Report Comments Should Be Read


Reports by GIA and IGI often don’t plot internal graining as a separate feature, especially if it is not the principal clarity attribute. However, the comments section usually contains the line, “clarity grade based on graining.”


This suggests that a diamond marked as VS2 or SI1 might actually have stronger internal graining overshadowing other inclusions. This also means that such features should inform your purchase and certainly with Rare Carat’s expert report features, those details will never be missed.


8. Internal Graining vs. Other Inclusions


It is vital to know that internal graining differs from inclusions like feathers or indent naturals. Mostly graining is a more complex feature which is included and is found as a feature within the structure of the diamond as in the case of the feathers whereas the indented naturals are a more superficial feature of the diamond which is found outside its structure.  


The internal vs. external debate is one that is crucial to understanding the diamond's value stem and is freely accessible at Rare Carat.  


 9. When Should You Avoid Internal Graining?


If the graining is:


 Listed as reason for the stone's clarity grade


 Dark or reflective in color


 Found directly beneath the diamond table


 Visible without a loupe magnifier  


...not to mention a few other requirements does mean a stone would have to be skipped. In the case of the grained diamonds with the clarity of 12/600 the above factors would suggest the stone most likely would have no color and lustre. The above parameters are likely to most hinder a diamond's sparkle.  


The clarity score given above does not mean the score was low. The cout of the stone was in this case easily masked its value. The Rare Carat value mask counter is frequently put to make diamonds that are unremarkable to the eye more overpriced relying wrongly upon the clarity and the so frowned upon price scoring system.


 10. When is Acceptable Internal Graining Acceptable?


Some form of internal graining is acceptable in the following cases:


 Only visible under magnification  


 Hidden in nonobvious areas  


 No impact on sparkle or transparency  


 Stone is adequately priced for the clarity grade  


With Rare Carat’s unique blend of advanced tech, expert gemologist analyses, and buyer protection policies, customers are able to buy diamonds with minor graining issues where the value justification is there.  


11. Trust The Company Whose Priority are The Buyers  


Rare Carat has innovated the way customers purchase diamonds. As a full-service platform competing with 1ctlabdiamonds and similar sites, it provides much more than just a directory. It does offer:


 Automated grading and cross listing with AI  


 Algorithm-influenced evaluations  


 Checkout with minimal hassle  


 Return, resize, and additional services  


 Trust, built from transparency and verified reviews  


With Rare Carat, buying a diamond is more than the purchase, it is an informed decision made with a dependable ally.


 Final Section  Considerations: Ophthalmology  Deeper Reflections: Further Considerations


Internal graining may not be a major concern, yet it is a feature that can be significant and worth knowing about. From a buyer's perspective: 


 Graining issues should always be marked off on a grading report


 Seek expert opinion, and more importantly, actual photographs.


 Use unbiased sources of information, such as Rare Carat


 Weigh graining in relation to price, carat, and cut


With proper resources and information, internal graining is simply part of a diamond’s narrative, not an enigma or a risk.



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