Beautiful facet pattern. Am I seeing a scattering of pinpoint sized carbon spots, or is that a reflection of something else?

I also think there is a feather (or crystal?) at 11 o'clock in the second image. But I believe it's going to be totally invisible with the naked eye. Quick estimate: these photos are 25-30x...

I see the "pepper" and I'm going with feather(s); however, every photo I see something "feathery" different... hard to tell what is actually there and what is a reflection (ie, I first was looking in the lower left quadrant). I need to study the pics more... I'm not very good a this; THAT is why I have David to help. 

I agree, I see some pepper, and possibly a feather in the top photo, almost nothing in the second, sure to be completely eye clean though.  i like the cut a lot, very pretty.

I see some "pepper" scattered through out the stone.  I think I am seeing a darker carbon spot in the lower left corner.  I do think I see some clear inclusions (not sure what kind) in the upper right quadrant, but I can't tell if other things I am seeing are reflections or more.  I do see some sort of feather or crystal "line" on the right side just below center.

Great observations one and all!

Let's start with the largest imperfection- this one is interesting in that it looks to be right on the edge of the diamond- but looks can be deceiving.....
I've circled it below.....

It's a fairly large stone Foxy...over 4 carats.....

Woo hoo, that was my line thing I mentioned at the end.  It wasn't visible as easily in the first pic though.

I did forget to say I really do like the cut of this stone!  Looks like it could be such a beauty in person!

About the one "significant" imperfection, in terms of visual importance.
I mentioned that it was an amazing optical illusion.
So much so that if one examined the diamond from the top, you'd immediately check the girdle to see if that imperfection was open.
But when you flip the stone upside down, you see that the white feather is nowhere near the edge of the stone.
It's just light playing tricks.

Below you can see where it's represented on the GIA plot.
Again, it's really not giving us the info we need, but it does prove to be a good guideline.
Once you learn to correlate how a lot of these markings look, you can use them for a component of identification.
Measurements, and weight are more user friendly.

Hummm... I'd set it between two rich, blue "home plate" shaped sapphires, then MAYBE a couple of shorter little baguettes or bullets on each the shoulder to transition down the shank...

You'd need help lifting your hand - have you seen the size of this stone?

I have no problem with the concept of HEFT for a ring.  However, Mrs. M., I agree here: this would be an excellent candidate for a pendant. In THAT case, I'd set it in rose gold with a pinkish brown halo and a diamond studded bale. It'd be HUGE. 

Furthermore, Mrs. M, I am quite impressed with your powers of recollection. I must be more diligent in my blatherings... 

The underhalo split shank sounds a fab idea, or just a solitare.

Foxylady