i understand clarity opinion can be different from...

[Dancing Fire]

grader to grader,but off on the color?

i mean what so hard about putting the stone next to a master stone and just match the color?

 

[hihowareyou]

I think there are three big stumbling blocks with colour.

1. Colour is a scale and grades are just points on that scale. Rarely will a stone actually match exactly with a grade and most will be in between, at which point you move up or down the scale means that for example some G stones will be closer to F in colour and some to H.

2. Colour looks different depending on how much material you are looking through. For example looking at 1cm of blue glass looks less blue than 5cm of the same glass. Looking at a stone from above, the side, top, slightly to the left, etc will change the way the viewer perceives colour.

3. The conditions you view a stone under effect the colour (I don''t know much about labs but I assume that they keep this consistent, e.g light source the same, in the same location, etc).

I think generally the big two labs are fairly consistent with their colour grades?