Is a 36 degree crown too steep?

[First_time_diamond_buyer]

Hi - hope to find you all well.

I've been trying to build up my limited knowledge of diamonds using this site amongst others.

I finally took the plunge and ordered on Friday through Blue Nile.

I bought a 0.84ct, G, VS1, Ideal cut, GIA cert.

The dimensions are 56% table, 62.2% depth, 36 degree crown, 40.6 pavilion. 6.01-6.05mm diameter. Excellent symmetry and polish. 3.5% medium to slightly thick girdle. No cutlet. It seems to rate ok on HCA, 1.8.

Having been a little OCD since then I was wondering whether a 36 degree crown is too steep?

Thank you!

 

[Karl_K]

with the right pavilion it can be great.
40.6 works with it.
The lower girdle percentage/angle is also important if it says its 80 on the report it should match ok, 75 it may not.
Optical symmetry can also have a affect.

However this is a combo that within gia rounding and averaging then grossly rounded it can be between it rocks and just ok.

 

[First_time_diamond_buyer]

Thank you Karl - much appreciated.

It says 80 in the GIA report. To your comment on rounding, is there anything that Blue Nile can produce to bottom this out?

 

[Lorelei]

Thank you Karl - much appreciated.

It says 80 in the GIA report. To your comment on rounding, is there anything that Blue Nile can produce to bottom this out?

Hi FTDB,

Ditto everything Karlster says, this could be a cracking diamond! BN do not to the best of my knowledge offer anything that can provide the actual numbers such as a Sarin scan, but it is a positive the LGF are 80% and if the cut precision is there and the optical symmetry good, then this diamond is well worth viewing in person. Give it a chance I would say as you have ordered it and take a look, you could also purchase an Idealscope for around $25 so you can view it more closely, there is a link here where you could order one.

http://www.ideal-scope.com/cart_order.asp?Ref=pricescope

BN have a good return policy so you have plenty of time to give it a good test drive.

 

[Karl_K]

Thank you Karl - much appreciated.

It says 80 in the GIA report. To your comment on rounding, is there anything that Blue Nile can produce to bottom this out?

Due to trade rules I can't comment on a specific vendor.
But one of the best prosumers ever has answered above.

 

[Lorelei]

Thank you Karl - much appreciated.

It says 80 in the GIA report. To your comment on rounding, is there anything that Blue Nile can produce to bottom this out?

Due to trade rules I can't comment on a specific vendor.
But one of the best prosumers ever has answered above.

I am so touched by your kind words Pal, you have no idea what that means to me, you have always been a fantastic mentor and friend, thank you. xoxo

 

[proto]

Bluenile can only provide additional information if the diamond they list has prevously been provided with additional info (such as if its held with another supplier who has access to these technologies).

this means no Asets/idealscope or other (for the vast majority of their stones).

Their signature line stones are all held in seattle, and they do not have any such facilities.

I know this after numerous calls to their customer line and asking what images they can provide and asking them to clarify what they exactly can and cannot provide, and if they will if I insist they try.

their GCAL report is not reliable and i think you can search "GCAL" to see a post from John to see the deficiencies in GCAL compared to other imaging technology as to brightness.

BN will do their best to tell you that because the stone has a GCAL report, that you dont need to see anything else. In my view, this is marketing fluff and you want to see at least an idealscope and preferably an aset before departing with your hard earned cash.

I would aim for:

54 to 58 table
60 to 62.4 depth
34.5 to 35.5 crown
40.6 to 40.9 pav

Just remember that the HCA is an elimination tool, not a selection tool. (I think gypsy has an excellent and more elaborate explanation on a few posts which you could find if you wanted to see more detail)

 

[newtodiam]

http://www.b2cjewels.com/dd-4819239-1.44-carat-Round-diamond-H-color-VS1-clarity.aspx

This is very similar to the OP's diamonds %'s, Karl would you consider this to be a good light returning diamond?

 

[First_time_diamond_buyer]

Ladies/Gents - thank you for the execellent/useful feedback.

I'm going to take the half glass full approach and expect it will rock.

I may pop to Hattan Garden to have it appraised by a diamond merchant as they will most likely have the ideal scope kit or similar.

Thanks again, very much appreciated.

 

[Karl_K]

http://www.b2cjewels.com/dd-4819239-1.44-carat-Round-diamond-H-color-VS1-clarity.aspx

This is very similar to the OP's diamonds %'s, Karl would you consider this to be a good light returning diamond?

The images speak for themselves.
It isn't h&a because of the deep clefts in the hearts but for this combo the long lgf's which cause the clefts are good.
It could have perfect h&a but have less performance if they were too short.

 

[newtodiam]

Karl I hate to sound naive but are you saying that those images are good for the dimensions?

 

[John P]

http://www.b2cjewels.com/dd-4819239-1.44-carat-Round-diamond-H-color-VS1-clarity.aspx

This is very similar to the OP's diamonds %'s, Karl would you consider this to be a good light returning diamond?

The images speak for themselves.
It isn't h&a because of the deep clefts in the hearts but for this combo the long lgf's which cause the clefts are good.
It could have perfect h&a but have less performance if they were too short.

Some clarifications:

The B2C magnified image is real, but the H&A images are generated from a computer scan and the ASET is generated by the AGS PGS. I think they are representative, but in most cases I'd note that computer-simulated H&A are pretty harsh.

Karl's comments are valid but I'd just add that cut precision is cut precision. He is correct that it's not a traditional H&A footprint, but that's not a big deal to me. In GIA and AGS metrics 57, 40.6, 36.0 is predicted to be Ideal/Excellent. And, deep clefts or no, the 3D precision (aka H&A) shows better than average in these simulations (at worst) and the actual precision may be superior to what the computer scan indicates (at best).

 

[Lorelei]

Ladies/Gents - thank you for the execellent/useful feedback.

I'm going to take the half glass full approach and expect it will rock.

I may pop to Hattan Garden to have it appraised by a diamond merchant as they will most likely have the ideal scope kit or similar.

Thanks again, very much appreciated.

Try to find an appraiser that doesn't sell diamonds otherwise any opinions offered might not be as impartial as you might wish...

 

[proto]

I would be surprised if hatton garden had imaging technology.

 

[Lorelei]

I would be surprised if hatton garden had imaging technology.

It's possible but no harm in trying if f-t can navigate the waters there, giving HG the benefit of the doubt here. If you do find someone there that has any type of cut grade analysis f-t, can you report back please as it is always useful to know?