Just to add to what I'd call 10/10 and what I'd call 8/10 I've had a look on erowid picture vaults.
This
http://www.erowid.org/chemicals/show_image.php?i=cocaine/cocaine__i2004e0691_disp.jpg
I woul say this is 9 to 10/10. Looks pretty similar to the 10/10 stuff I've had. Intersting this pic comes from spain! The real 10/10 stuff I've had looked slightly yellower and shinier than this stuff, but that could be just the camera or a different batch or whatever. This stuff is always slightly moist and will not cut into lines. Notice though this is DEFO NOT a white powder. Real Cocaine is not a white powder.
This
http://www.erowid.org/chemicals/show_image.php?i=cocaine/cocaine7.jpg
is what I'd call 7 or maybe 8/10. It still has a slight yellow tinge to it, and still has a slight "shine" to it. BUT you can clearly see it's been cut with some white powdery bulking agent and repressed, hence why its in "chunks" like that. It gets so firmly pressed, and the dry powder cut makes it into hard chunks, not a million miles away from when pharmacutical companies press pills. This is as good a coke as your likely to get on the street, and even then this would be a from a really well connected dealer, who's only stepped on his stuff about 30%. My prediction would be they bought a few keys straight from the importer for around £70k, bashed it around 30% with some cutting agent then sold it for between £80 and £100 a gram.
1 kilo = 1000g.
1000g + 30% cut = 1300g cut product
1300g x £80 = £104000
So that represents a profit of £34000 per kilo (almost exactly 50% ). Not bad tax free.
Thing is that would be a good dealer out to make sensible money for good product. Not fucking 18 year old wanabe gangstas looking to make a quick buck.
Im not trying to dicksize here or show off, but I am literally surrounded by users of this drug cos of what I do for a living and I travel all over the world (wont discuss it in public but feel free to PM me if your interested), and like I said previously, last year I had 5 oportunites to buy stuff of this quality. And I've only seen the 10/10 stuff once or twice in my 10 years of using.
Very sad indeed.
EDIT - I just re read that and it sounds like I work selling or dealing drugs or something. I don't its just I work in an industry with long hours, and a lot of partying so drug use is very common. Just dont want to discuss my job on a public forum about drugs.