is 33/41 a good CA/PA combination ?

[bigbig]

Hi diamond experts:
I have found a diamond with 3Ex, HCA=0.7. but the crown angle is only 33. Is it the so called the shallow crown?
and any concern from the idealscope picture ( it is not very clear unfortunately)?

Thanks

table 57%
depth 61%
CA 33%
PA 41%

 

[metatrix]

No. That's perfect proportions. For a table of 57 and a PA of 41.0, you want the crown angle to be between 32.5-33.5. Not only is the HCA spot on, but that's AGS 0 proportions as well.

The IS looks good. The ASET is good too except that there seems to be a bit of unevenness in the girdle - notice that there is bit of green at the edge between the arrows at 11, 1, 2, and 4 o'clock. I think that indicates a slight bit of digging of the girdle or possibly some type of azimuth distortion or yaw? There is no sign of girdle painting though.

Any ASET experts want to chime in here and confirm or deny?

 

[teobdl]

That combo is not a slam dunk--you need a certain table size and certain lower girdle facet length (not more than 80%). The combo on that specific diamond works very well.

 

[Karl_K]

No. That's perfect proportions. For a table of 57 and a PA of 41.0, you want the crown angle to be between 32.5-33.5. Not only is the HCA spot on, but that's AGS 0 proportions as well.

Where did you get 32.5-33.5? a true 41 pavilion is good out to 35 crown with the right lowers and table and decent precision.
The rounded GIA numbers wont cut it when you get into the higher crown range however.
Have to have images.

 

[Karl_K]

The scope is tilted on the ASET image I am willing to bet.
It makes no sense the way it is.
But there is enough there to indicate the stone is fine.

 

[metatrix]

The scope is tilted on the ASET image I am willing to bet.
It makes no sense the way it is.
But there is enough there to indicate the stone is fine.

Is the H&A scope image also tilted, then?

 

[SirGuy]

Looks okay to me. Karl brings up a good point about lower girdle facets and how they play to the stuff up above.

Check out this link for some fun education, with handy images.

http://heartsandarrowsgrading.com/hearts-and-arrows-formation/

 

[diamondseeker2006]

I prefer at least a 34 crown angle with a 41 pav angle.

 

[bigbig]

metatrix , teobdl , Karl_K ,SirGuy and diamondseeker2006 , thanks so much for your informative reply.
actually I am pretty new here and just start learning how to find a good diamond very recently.

This diamond is 2.05 carat, F color. Vs1 clarity. 3 EX
Here is more clearn picture about its propotion.


My other concern is that it has a strong blue fluorescence. I do not care the resale price. But I hope it does not influence the beauty of the stone.
The price is about 30K. is it a good buy? any warning? confirm or deny?
Thanks!

 

[metatrix]

You should not buy a stone with strong fluoro unless you can examine it yourself outside in direct sunlight, OR you are buying from a vendor that you absolutely trust to check for haziness on your behalf (BGD and GOG come to mind).

 

[RockyRacoon]

The IS looks good.

Is there an Idealscope image that I'm missing here?!

 

[bigbig]

The IS looks good.

Is there an Idealscope image that I'm missing here?!

yes. in the orignal post. but not very clear.

 

[metatrix]

The IS looks good.

Is there an Idealscope image that I'm missing here?!

My bad...for some reason I thought the arrows image was an IS photo with inversion of black for white in the arrows. No idea how or why I came to that bizarre conclusion...

 

[RockyRacoon]

The IS looks good.

Is there an Idealscope image that I'm missing here?!

yes. in the orignal post. but not very clear.

The image in the original post is actually an 'Arrows' image, as opposed to an Idealscope image. It would tell you more about symmetry than light return.

An Idealscope would be helpful here, to help assess light performance, as the numbers do not make it clear that this would be a top performer.

Let me see what else I can spot at about that price point that might be tempting, for comparison purposes!

 

[RockyRacoon]

Let me see what else I can spot at about that price point that might be tempting, for comparison purposes!

Here are 5 solid options, all with top-notch cuts, in your price range:

2.4ct, H, SI1
http://www.goodoldgold.com/diamond/12086/

2.01ct, F, VS2 (with Medium Blue fluor and a HCA score of 1.7, this one might be my pick)
http://www.jamesallen.com/loose-diamonds/round-cut/2.01-carat-f-color-vs2-clarity-excellent-cut-sku-315229

2.01ct, G, VS1
http://www.jamesallen.com/loose-diamonds/round-cut/2.01-carat-g-color-vs1-clarity-ideal-cut-sku-126851

1.85ct, G, VS2
http://www.goodoldgold.com/diamond/12251/

1.838ct, G, VS1
http://www.briangavindiamonds.com/diamonds/diamond-details/1.838-g-vs1-round-diamond-ags-104071675027