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<p>[QUOTE=&quot;desertgem, post: 901110, member: 15199&quot;]The areas that you are mentioning, surface alteration ( cleaning) , artificially induced chemistry ( toning), and grading are always going to be subject to dispute when they get to the event horizon, even by any top 2 dealers/graders, etc. due to subjective versus objective visioning. Yes, there are obvious cleaning jobs, obvious AT, center of a grading range, etc, but when the difference is very small, since we form our opinion by what we &quot;see&quot; rather than by a physical measurement, there will be variation of how the brain converts the photo/chemical reactions to light ( vision) to neural interpretation within the cerebral cortex (sight). We know the end point as that is what we &quot;see&quot;, but it may not be real. The brain can modify what we think we see by other&nbsp; +/- factors and memory recall. In other words we each tend to cheat a little to see what we want or expect to see. That is why TPG use multiple graders for the end determination, and why on threads here since we don&#039;t each have the coin, there can be much debate. Experience helps with the memory modification of vision, so the more experience one has in grading and cleaning, etc.,the more firm their answer will be, but it might still be a minority.</p><p><br /></p><p>Counterfeits, unless they are made by the same dies and process, will always have some minute, often very minute difference which will allow them to be identified. If not, and they are accepted by TPG, like some AT, they are market acceptable, and sell for the same price. IMO. Sorry so long.[/QUOTE]</p><p><br /></p>

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