I am an independant gemologist and I hope to find someone here thats had a lot of experience with colored diamonds. I have usually only worked with white diamonds but recently aquired a rather large parcel of stones from the ARGYLE mine. These stones vary in color from yellow/gold to white to reddish brown, to an almost greenish color. I have some pricing references but they do not cover a very broad range of stones. Also as for the brownish colors, the typical grading is from C1-C7 but I have no comparison stones like I do for white diamonds can anybody suggest a source that I might be able to use for grading these stones?