http://www.graffdiamonds.com/ may not give much information, but I can tell you when I walked by the Graff Diamond shop on Bond Street in London yesterday, there were huge diamonds in the window.
would have that catagory , just do the search from 5.00+cts. & up ,and put in the color and clarity you are looking for ,it should give the prices of larger stones.
Don't know where you are located, but there is a jewler in Chicago you can try at http://www.lesterlampert.com. I have an Aunt who bought a gorgeous 7 carat Radiant there several years ago. Lampert has an excellent reputation and impressive history. I own a piece or two from there as well, although my pieces are low end compared to the normal transaction there.
Good luck.
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