I didn't know that they could tell the clarity and color of a diamond before it was cut from the rough. My wife and daughter LOVE cats. I just like em. Cutters can determine, to a point what the outcome will be by doing 2 things. It's color will be known from just a cursory observation of the rough.
Rough stones do reveal the color before being cut.
There is colorless rough, near colorless rough, tinted and so forth. Hope this helps. It is quite interesting to me the decisions that are made about a piece of rough and the process to have a finished and polished diamond. Glad to hear that you have some cat lovers in your family. We have seven fine feline friends.