Questions about Inclusions (feather) and Certificate for Diamond

[laurencat13]

I have a couple questions about this diamond and would like some opinions on it.
This diamond is a 1.52 ct and has a feather that looks like a straight line. The feather can be seen in the photo near the lower left side of the diamond.

1.I've been reading that a feather is a small crack on the inside of the stone. Does this mean that feather is a hollow space?
2.The GIA certificate shows the feather and a pinpoint but nothing else. Does this mean that the diamond got the SI2 grade because of only these inclusions?
3. The GIA certificate has a symbol that says "natural" but I do not see this shown on the drawing of the diamond. Is this just a way of saying that the inclusions are natural?

Aside from a professional, I'm the only one who can identify the feather and that's mostly because I know where to look for it. I would like to understand the GIA certificate better and gain any knowledge I can about the inclusions on this diamond. Please let me know if I should be concerned about the feather. I try to be gentle with the ring.

A little background on the diamond. I bought it from James Allen a couple years ago for $7,710. I am not sure if this was a good price, but I have been very happy with the stone and I like the other specs on it.

 

[flyingpig]

1Hopefully trade members answer this question
2. Correct. The feather is probably THE SI2 grade-determining inclusion by looking at the size
3. Most naturals are on the girdle. Please check the diagram again. 1130 location. pavilion side. It is tiny

 

[Karl_K]

The first listed inclusion is usually the grade setter unless there are lots of inclusions. For example multiple vs2 inclusions can result in a si1 grade where if it was just one of them it would be a vs2.
The feather sets the si2 grade in this case and the other inclusions are minor. There may be other inclusions that are not listed nor plotted because they are not visible at 10x or are minor.
For example in a si2 diamond inclusions that would make a diamond a vvs2 vs an IF are likely not to be plotted nor mentioned.

Also naturals could be largish and grade setting and still be on the bottom of the list.
There effects should be considered separately from the other inclusions in a lot of cases. Particularly durability concerns.

 

[Karl_K]

One of the diamond cutters would be able to explain this better than me but this is my understanding.
Not all feathers are voids if the diamond cracked during the growth process the crack may fill in and be whats called a healed feather.
If the feather forms from a crystal exploding during the cutting process or anytime after the crystal stopped growing it may be a void.

 

[laurencat13]

1Hopefully trade members answer this question
2. Correct. The feather is probably THE SI2 grade-determining inclusion by looking at the size
3. Most naturals are on the girdle. Please check the diagram again. 1130 location. pavilion side. It is tiny

I never even noticed that that's where the natural is. Thank you for the help!