I am currently looking into upgrading my current stone, a J, to a larger K stone. My original ering was a G (probably more like an H or I since it wasn''t certed), and I now have the J. I''ve had the J for about a year, and I did notice a *slight* color difference when I got it, but over the last year, I''ve really come to like the stone and the color doesn''t bother me at all now. So my question is, if I don''t mind a J color, will I see much difference if I upgrade to a K color (assuming that both the J and K are excellent cut stones)? I have been to some jewelry stores, but I haven''t seen an AGS/GIA graded K in person. I did see a J which is what prompted me to go with my J in the first place.