You could have internal strain which would be a result of structural irregularities. These are usually brought about by inclusions in the stone.

Good luck on your purchase.

Rather than make the diamond look poor because of a drawing, the comments are used to indicate that extremely tiny, yet possibly numerous inclusions are in the stone that cannot be realistically drawn due to both the limitations of the computerized drawing programs being employed and the limitations of the human eye to see correctly drawn microscopic inclusions.

I hope that makes sense to you. Comments are seen to be negative, but actually there is a very positive twist to having inclusions so small one cannot draw them.

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David Atlas
Accredited Gem Appraisers

What has your experience been with the stones where it is noted: clouds not shown?

Sometimes the "cloud(s) not shown" is(are) large or the entire stone is cloudy. This is a true dilemma and each diamond must be examined. That's one more reason a Cert does not replace looking at the actual stone.

Comments are taken by the trade as negatives because they are not readily interpreted in a positive way until one examines the diamond. Then it is a matter of negotiation. Negotiation is the way all diamonds are bought unless they are D-FL and fine cut. Every other grade combination requires fine tuning or you are not a dealer. It is not a matter of pride, culture or attitude, but simply that is how business is conducted in diamonds between diamond dealers. Without negotiation you become a target customer and will quickly spend your money and go home with less than you should have been able to buy.

Diamond profits are very slim between experts. Knowing the methods of correct and polite negotiation are key to working the "comments" section of grading reports.
The real profits lie in having enough non-negotiating customers that you can make a living.

I thought so!