It would be all too easy for me to suggest that you just ignore this person, but some explaination is required.
This individual, whom I don't know, has been on an apparent crusade to discredit and damage the SuperbCert brand of diamond and the company run by Barry Gutwein in this public forum (as you no doubt have seen). Why, I can't answer. This appears to me to be an irrational attack suggesting fraud and deception, relentlessly applied in an apparent attempt to do damage to this business.
Unfortunately, these diatribes also indirectly do damage to those others of us who work with Barry in vending the SuperbCert brand as part of our own businesses. However, I can assure you, as one who has worked with this product since it came on the market, that I, and I'm sure all the other SuperbCert vendors, stand behind both Barry and the brand 100%.
The comments this person makes about GE POL diamonds and strain also appear to try to cast aspersions on the company...keep in mind that this individual is NOT, so that one can notice from his previous contributions, knowledgeable about diamonds.
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The GE POL diamonds are those brown type 11a (quite rare @~1% all gem diamonds) stones treated with high pres. & temp. (HPHT) to improve color...see http://www.gia.edu/gemsandgemology/1423/1840/524/issuersquos_table_of_contents_article_detail__this_page_is_only_a_place_holder_please_contact_it_department_for_content_changes.cfm for an excerpt.
There is a market for them and they are required to be properly marked and disclosed by sellers. There is, of course, some reported abuse of this - the level unknown.
Virtually all brown type IIa diamonds show strain patterns (anomalous birefringence) when viewed through crossed polarizers, and the HPHT treatment does little to alter these patterns. Treatment can be detected in many cases by observing other features.
Oh, a large % of common gem diamonds, types 1aA & 1aB, also show strain patterns, and the argument rages as to whether or not it is important to know this for durability (read that "purchasing") issues. It is agreed that knowledge of strain in the rough crystal is important info for cutting, with the attendant heat, pressure and vibration, but is it important for the dealers/retailers/consumers who deal with the polished diamond?
Consider this - diamonds range in age from several 100M to 3Billion years in age!, and they have lived with whatever strain they have that long without "popping".
Strain patterns are associated with crystal lattice distortions caused by all types of things - inclusions, cleavages, twinning, etc. It ain't hard to find, but is it important?...no scientific evidence I am aware of has unambiguously fingered strain as being a predictor of polished diamond breakage...please correct me if any of you are aware of this info.
Should you have your diamond checked for strain prior to purchase? That's your call, but ask yourself - why am I doing this?
Should you balk at the purchase of a beautiful stone on the basis of a strain pattern?... Again, it's your call, but personally, I wouldn't. Why shoot yourself in the foot, when you are going to insure the stone anyway...you WERE going insure it weren't you???