- Apr 3, 2004
Is it possible for a 15ct rough to yield a D and a J colored stone? I know it can yield different clarity but how about different colors?
You have better memory than I do @Lessics That's exactly how things went down with that project.Didn't poshmommy get a beautiful custom cut diamond by Victor Canera, where the initial rough resulted in a I and J (poshmommys stone) colored diamond?
I have a question. While it’s completely true that you can actually have two different colours from the same rough diamond, but wouldn’t one stone show a 5% shade of another and vice versa irrespective of size?Sorry for coming to this thread a little late. I will try to explain it as simply as possible. There are actually two aspects at play, independently, and when one thinks about the second aspect, one could wonder whether lab-grading of color, as it exists, makes logical sense.
Aspect 1 is color-zoning. This exists and can have various causes. But let's just agree to the simple fact: tint is not necessarily evenly distributed across a rough diamond.
Aspect 2 is possibly more interesting, as it shows a relationship of color with size and cut-quality.
This often is the case in a nice rough crystal, lending itself two two polished diamonds, one clearly bigger than the other. Just imagine a 1.20 Ct. and a 0.45 Ct.
Now, suppose both, for sake of simplicity, to be cut in the same cut-quality and in round brilliant.
We generally state that the color of diamonds is graded from the side because this allows to observe the true body-color. But is that reasoning fully correct? In diamonds of a smaller size, the light goes through less diamond material before exiting. The result: with the material having the same color, a smaller diamond cut from that material can be graded a higher color than a bigger diamond from the same material.
Hope this helps.
after sawing https://www.dropbox.com/s/g83hxysjczwm64a/4_After_Sawing_G915 AND 915-A_1X+2X+3WXX_WWWWWL+X_AV13+TV1-30+ISO160_OWWALL_MONO_CC_LV_Full rotation_111017_WBG_REF.mp4?dl=0Wow. That blue radiant is quite a stone.
This tells of how wide the FVY range is & what it means being small & vivid!Yellow 10 Fancy Vivid ... and 1ct Fancy yellow ... from same rough. In this case the rough had not any color zoning and only difference in the size crated the difference in color
11 polished diamonds from E to L from one rough.
You may see here how color grade depends from size and cut of polished diamonds( the rough had color zoning also)
WOW! This is fascinating, amazing, and so educational. Thank you, Serg, very much.
May be the rough had not color zoning,