I recently purchased a diamond from JA. It had a very good HCA score and IS image, but I feel it had an obstruction issue. I have black, long hair, and I felt like I couldn't look at the diamond without seeing it dark in the center (ok this is an exaggeration, but it occured frequently). Here are its numbers:
Crown angle: 35
Pavilion angle: 40.8
LGF: 75% GIA certed (this was the issue?)
total depth: 61.4
table: 58
star length: 50
girdle: medium to slightly thick faceted.
It was a very sparkly and firey stone, however.
Could I eliminate the problem of obstruction with a steeper pavilion angle and shallower crown angle only? Or must I get longer LGF? For example, I am considering this stone which has the same LGF but looks quite different:
http://www.jamesallen.com/diamonds/J-SI2-Ideal-Cut-Round-Diamond-1378778.asp
What accounts for the larger white area in the center of this diamond (the one above) vs. the one below, for example? (Sorry I cannot copy or save their images) Something with the pavilion main facets? Why do the arrows seem relatively thin (more space between them / not as fat as most LGF 75% I have seen on the virtual loupe-like the one below) for a 75%? Is it because of the larger white center area? How will this white area in the center perform? Also, I just wanted to mention both these stones have 75% LGF but yet look different.
http://www.jamesallen.com/diamonds/D-VVS2-Ideal-Cut-Round-Diamond-1317083.asp
Sorry for all the questions, if it's too much to sift through and answer here is the MAIN QUESTION: I know there is a lot of rounding here on the GIA reports, but what I am trying to ask is aside from the actual LGF percentage, what affects the thickness of the arrows under the table (ie: something with the shape of the pavilion main facets? is the effect from the pavilion angle large-41 degrees with 75%will look different than a 40.6 degrees with LGF 75%?).
I know there are a lot of threads on LGFs, but I couldn't find the answer to my exact question. Hopefully someone will understand my poor writing skills and newbie way of describing everything.
Thanks for getting through this long post and for your help!
Crown angle: 35
Pavilion angle: 40.8
LGF: 75% GIA certed (this was the issue?)
total depth: 61.4
table: 58
star length: 50
girdle: medium to slightly thick faceted.
It was a very sparkly and firey stone, however.
Could I eliminate the problem of obstruction with a steeper pavilion angle and shallower crown angle only? Or must I get longer LGF? For example, I am considering this stone which has the same LGF but looks quite different:
http://www.jamesallen.com/diamonds/J-SI2-Ideal-Cut-Round-Diamond-1378778.asp
What accounts for the larger white area in the center of this diamond (the one above) vs. the one below, for example? (Sorry I cannot copy or save their images) Something with the pavilion main facets? Why do the arrows seem relatively thin (more space between them / not as fat as most LGF 75% I have seen on the virtual loupe-like the one below) for a 75%? Is it because of the larger white center area? How will this white area in the center perform? Also, I just wanted to mention both these stones have 75% LGF but yet look different.
http://www.jamesallen.com/diamonds/D-VVS2-Ideal-Cut-Round-Diamond-1317083.asp
Sorry for all the questions, if it's too much to sift through and answer here is the MAIN QUESTION: I know there is a lot of rounding here on the GIA reports, but what I am trying to ask is aside from the actual LGF percentage, what affects the thickness of the arrows under the table (ie: something with the shape of the pavilion main facets? is the effect from the pavilion angle large-41 degrees with 75%will look different than a 40.6 degrees with LGF 75%?).
I know there are a lot of threads on LGFs, but I couldn't find the answer to my exact question. Hopefully someone will understand my poor writing skills and newbie way of describing everything.
Thanks for getting through this long post and for your help!