Here's some more info about this rough- and diamond cutting in general......
I can't emphasize the importance of waste- or lack of it in planning the diamond.
Think about this- we go thru a lot of effort to mine this thing, then simply grind away a part of it?
You definitely want the portion you grind ( cut) off to be the smallest possible.
Like Polished diamonds, Rough diamonds are sorted into different categories.
Of course size is the first factor taken into account. The large pieces are quite rare.
Another characteristic by which rough stones are sorted has to do with how they'll be cut.
In many cases the rough is octagonal, like this one
The diamond in the youtube above was be sewn ( sawed) into two pieces, which will then each became their own diamond.....
Here's a diagram of an octagon which explains what I'm talking about:
Below I've marked where they might cut the diamond, with a very special saw- can you see how sawing off the top part gives you a piece which already has the profile of a diamond-
A lot of the light yellows we get are actually top pieces after polishing.
Anyway, such rough diamonds are known as "Saw-ables"
The subject of our contest is known as a "Make-able"
With "Make-able" rough, you put it right on the cutting wheel.
It makes the most sense to polish it into one diamond. AS the 5.28carat one will be.