Would 33 crown angle and 41 pavilion angle be too shallow?

[bostonvr6]

I am looking at a Round stone
1.30CT
7.05 x 7.07 x 4.30
Triple Ex

Crown 57%
Depth 60.9%
Crown angle 33 degrees
Pavilion angle 41 degrees
Medium to slightly thick 3.5% girdle

HCA within TIC range - 0.7 - Excellent

Light Return - Excellent
Fire - Excellent
Scintillation - Excellent
Spread - Very Good


Is the pavilion too shallow? Can the 33 degree crown help alleviate any negative effects of having such a shallow pavillion?

I want the diamond's light return to be as best possible so if this stone is "okay" then i will keep looking. Obviously HCA says its good, but just wanted to know based on people's real world experience, not just a HCA computer algorythm.

Thanks!

 

[JulieN]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

Need an Ideal scope or ASET.

 

[kaoms352]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

With a pavilion of 41, I would say you need a crown angle of 33.4-34.8 degrees.


I would keep looking if you want the light return to be the best possible. You need to stay between 54-57 degree table, crown angle between 33.8-35 and pavilion between 40.5-40.8. I wouldn't rely in the HCA calculator too much, it is only useful for weeding out scores under 2.

 

[kenny]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

With a pavilion of 41, I would say you need a crown angle of 33.4-34.8 degrees.


I would keep looking if you want the light return to be the best possible. You need to stay between 54-57 degree table, crown angle between 33.8-35 and pavilion between 40.5-40.8. I wouldn't rely in the HCA calculator too much, it is only useful for weeding out scores under 2.

… over 2.

Also HCA is only step 1 of 2.

1. Reject rounds that score over 2.
2. Get Idealscope image on those scorning under 2.

I suspect this IS image would reveal problems.

Anyway I'd just pass on it without asking for an IS image since the CA is so low at 33 degrees.

 

[MissGotRocks]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

Yes, the crown angle is too low - the pavilion angle is not shallow at 41.

 

[MissGotRocks]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

With a pavilion of 41, I would say you need a crown angle of 33.4-34.8 degrees.


I would keep looking if you want the light return to be the best possible. You need to stay between 54-57 degree table, crown angle between 33.8-35 and pavilion between 40.5-40.8. I wouldn't rely in the HCA calculator too much, it is only useful for weeding out scores under 2.

Conventional wisdom says pavilion angle between 40.5 - 40.9

 

[diamondseeker2006]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

I think pav angle should be 40.6-41.0, crown angle 34.0-35.0.

 

[D&T]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

get an IS image. I purchased quite a few diamonds in many different crown and pavilion angles some from 32-35.5 degrees all the way up to a little over 41 degree in pavilion. After having super ideal diamonds ACA, Brian Gavin, some H&A designated stones which has scored over the 2 HCA. I determined, for me personally that I was fighting this battle of trying to purchase diamonds with "strict numbers" when all likelihood after receiving the diamonds in hand that scored well less than the Ideal HCA and also having "less then the ideal" pavilion and crown angle the diamonds were equally as beautiful to my eye as many with those that many would say stick to. If you were to put them side by side and stare at it under numerous of lighting condition, there may appear very minute difference that many if not the majority of people out there will not be able to detect. In any case, I'm in the minority here that may say it might not be a bad stone but get an IS and if feasible possibly find another stone with the "strict numbers" and purchase both, then determine which ones you like more when you see them with those difference in numbers.

Just for kicks:
This is a diamond sold long ago, and it has a crown 33.25 and pavilion 41.29, it sure looks beautiful to me. just to give an idea, although the depth is deeper than yours and in fact rate on the HCA at a 2.2. So numbers may tell one thing but seeing the diamonds images and diamond itself may tell a different story.

http://www.goodoldgold.com/diamond/2370/

 

[diamondseeker2006]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

I was just guessing that he is dealing with someone who does not provide idealscope images. The ballgame changes a bit when you have that. I go by the numbers pretty strictly when there are no images.

 

[D&T]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

I've seen too many posts recently and I've only been back just for a little bit that has steered posters away from 33 or even at 35.5 crown and as well as pavilion in the 41 range when in reality the difference could be so small that many posters are saying that these types of diamonds are "not going to perform well"

here is another thread to help ease the discussion as well.

[URL='https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/']https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/[/URL]

 

[Laila619]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

Well, it's not my favorite cut, but you might like it. I prefer a shallower pav and a steeper crown.

 

[Karl_K]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

I think pav angle should be 40.6-41.0, crown angle 34.0-35.0.

54-57T/41 or even 41.1/34-34.5 77-80 lgf is one of my many favorite combo ranges.

33 degree crown with a 57 table is slightly shallow but combined with the right pavilion can be an awesome combo.
41 or even 41.1 is a good match for a 33 crown with the right lowers.

Since GIA badly rounds numbers an IS/ASET image would be a good idea and if h&a is claimed then actual h&a images should be provided.

 

[treasurehunter]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

Fire will no doubt be lesser at those angles correct but brilliance is still very high?
What advantage/disadvantage does the 41pac ,33ca have?

 

[bostonvr6]

Re: Would 33 crown angle and 41 pavilion angle be too shallo

Sorry for the delayed response everyone.

So sounds most people are recommending against this stone.

I cant get an ASET from this vendor i have to go strictly by the math and technicallities from the Cert. Of course if i get desperate i can just order it and check it out and return it if i really dont like it. But i have about another week before there is a gun to my head to order. Need a ring by Dec 17th ha.

Thanks