Inclusions & Blemishes

Diamond Blemishes: Natural | Rare Carat

 Diamond natural on GIA certificate

Natural as represented on GIA report

Naturally, the process of choosing a diamond can be difficult. You need to think about the shape of the stone, the size of the stone, the color of the stone, and clarity of the stone. It’s all ‘G , VS2’ this and ‘J SI1’ that. Seriously, it’s overwhelming. But on to the blemish, a natural!

What is a Natural on a Diamond?

I don’t actually like classifying naturals as blemishes. That’s because naturals, unlike certain other blemishes – I’m looking at you ‘burn marks’ - are not the result of sloppy workmanship on the part of a diamond cutter, or the careless handling of the stone by other people. Naturals are actually just teeny tiny bits of the original ‘skin’ of the diamond from when it was in it’s rough form (i.e. before being polished up).

1/4 of a diamond with a red arrow pointing to a flat section of the diamond called a natural

This natural is very large and although it would throw off symmetry, it doesn't enter the realm of clarity. Maybe skip this one.

Not to be confused with ‘indented naturals’, as those tend to creep further up on to the crown of the diamond, or nestle down into the stone itself. Simple ‘naturals’ in the form of blemishes on the other hand, keep their hands to themselves and stick to the area around the girdle (FYI that’s the thin perimeter of the stone).

Naturals are not going to ruin your diamond, and will not impact the integrity of the stone (i.e. make it weak or subject to breakages). If you have shortlisted a diamond that has a natural, just know that naturals (just like most blemishes in fact) can actually be removed by re-polishing the stone. This will mean that;

A. You will have to incur the cost of that re-polish, so find out how much it will cost.

B. The weight of the diamond will go down as you are essentially ‘shaving’ some away in order to get rid of that blemish.

Natural Diamond Blemishes FAQs

Does having a natural inclusion mean the diamond is flawed or weak?

Not always. Many natural blemishes are cosmetic—they don’t affect how the diamond looks face-up, and they don’t necessarily pose a durability issue if they’re small and placed away from vulnerable edges. But if the blemish is large, deep, or located near a thin edge or girdle, it could become a concern.

What should I check if I’m considering a diamond that mentions “natural” or “indented natural”?

You should ask to see detailed magnified images or a video of the stone so you can assess how visible the inclusion is. Check the grading report for how many naturals are noted and where they are located. If the mark is under the table, near the edge, or appears face-up, you may want to opt for a cleaner stone.

If a natural is noticeable, can it be polished away or fixed?

Yes—in many cases a jeweler can re-polish the stone surface to remove or smooth out the natural. But this means a small loss in carat weight, because removing a bit of surface means slightly reducing the size.
Dr. Rian Mulcahy
Dr. Rian Mulcahy
Rian is officially a Diamond PhD - just ping us if you’d like to read her fascinating 200-page thesis, titled Facets of Value: An Investigation into the Formation of Worth in the Diamond Market. She has consulted various firms all along the pipeline, from the rough diamond market to the recycled diamond industry. She holds an MA in Globalisation and Development from University College Cork and a PhD in the Sociology of Diamond Valuation from the London School of Economics.