CA 36 PA 40.3?

[Gemly]

I’ve been looking at diamonds with ideal stone specs but I came across this stone and wondered if this might preform as well or possibly even better than an ideal (CA 34-34.9 PA 40.6-40.9). This specific stone has a 55.5 table. Here is a photo. Wondering if it’s worth considering.

Also worth noting that polish is listed as “very good” which is something I haven’t seen much and so I’m unsure if this is a stone that should be rejected simply on this basis.
Thanks PS crew!!!

 

[MRBXXXFVVS1]

Can you list more specs and run it through the HCA? I would personally reject all stones that don't meet XXX at a minimum.

 

[Kaycee2018]

Which lab graded it?

 

[flyingpig]

Positives: Technically, little to minor leakage. Clear contrast and arrow.

Negatives: With 40.3 PA and 55 TBb the arrows start to get elongated and overwhelm the table. Additionally, 40.3 PA makes the arrows persistently dark. You need to increase the viewing distance beyond normal arms length to light these arrows up.

As Garry says, good for earrings and pendants.

If you are going this route, try 40 CA and 40 PA. Supa steep and shallow combo.

 

[Karl_K]

What @flyingpig said.

 

[Gemly]

Thanks! HCA was a .9 which gave me additional pause. When you say that the arrows elongate, that means they basically go from the table reflection to girdle kind of taking over the whole stone? You mention that arrows will stay dark at arms length; What is the usual distance that you would expect arrows to light up?

And finally, the positive you mention is that there is minor leakage; How can I determine this myself by looking at a photo of a diamond such as this? I plan to make a purchase very soon so am trying to learn as much as possible.

 

[flyingpig]

1.01 Carat round diamond

This 1.01 carat round diamond K color vs2 clarity has Very Good proportions and a diamond grading report from GIA

www.jamesallen.com

This is probably close to 40PA/40CA

1. Notice small table reflection and the arrows shafts taking over the table. Your 36 CA /40.3 PA is not as dramatic, but it definitely has a small table reflection and long arrows compared to ideal cut diamonds.
2. I do not have hands-on experience with 36/40.3. So cannot answer about obstruction and viewing distance in detail. I know 35/40.5 requires some viewing distance, not quite arms length
3. You just need to look at thousand of videos and photos and teach yourself. Start with modified cushion brilliant and radiant, then princess, oval, hearts, OEC. The MRB is the hardest to see leakage without ASET, especially when the proportions are within or close to the recommended ranges. Plus, you really need well taken videos and photos. JA and WF are good. BN videos are a bit difficultt. Step cuts are another different topic. Facets with strong light return and leaky facets just look different. See the JA stone I linked. You can see this stone has almost no leakage. It is reflecting white light, hiding its brown body color very well, despite the proportions no where close to the recommended ranges.

Lastly, I am not liking this 36/40.3. The pavilion and arrows are a bit uneven and wonky. There are some spots I cannot tell if it is leakage or light return. Regardless, still better than many steep deep GIA Ex with HCA score of 3.0 or higher.

 

[Karl_K]

1/2 arm length is considered the range for changing from dark to bright arrows for ring stones..
It varies from combo to combo(person to person) how much is changed at that point but it should be observable around that range.

 

[Gemly]

1.01 Carat round diamond

This 1.01 carat round diamond K color vs2 clarity has Very Good proportions and a diamond grading report from GIA

www.jamesallen.com

This is probably close to 40PA/40CA

1. Notice small table reflection and the arrows shafts taking over the table. Your 36 CA /40.3 PA is not as dramatic, but it definitely has a small table reflection and long arrows compared to ideal cut diamonds.
2. I do not have hands-on experience with 36/40.3. So cannot answer about obstruction and viewing distance in detail. I know 35/40.5 requires some viewing distance, not quite arms length
3. You just need to look at thousand of videos and photos and teach yourself. Start with modified cushion brilliant and radiant, then princess, oval, hearts, OEC. The MRB is the hardest to see leakage without ASET, especially when the proportions are within or close to the recommended ranges. Plus, you really need well taken videos and photos. JA and WF are good. BN videos are a bit difficultt. Step cuts are another different topic. Facets with strong light return and leaky facets just look different. See the JA stone I linked. You can see this stone has almost no leakage. It is reflecting white light, hiding its brown body color very well, despite the proportions no where close to the recommended ranges.

Lastly, I am not liking this 36/40.3. The pavilion and arrows are a bit uneven and wonky. There are some spots I cannot tell if it is leakage or light return. Regardless, still better than many steep deep GIA Ex with HCA score of 3.0 or higher.

Thank you so much for taking the time to give me this thorough explanation. That really helps. Sounds like this particular stone is probably not a great contender.

Can you tell me, generally, what effect “very good” polish has on a stone? I’ve come across this a couple times and wonder if that should be an instance eliminating factor of all other specs are good. Thanks again so much for your time and help!

 

[Serg]

CA 36 PA 40.3 is similar to CA 34.5 PA 40.6 .
To it can not has a big head obscuration.

 

[Karl_K]

Can you tell me, generally, what effect “very good” polish has on a stone?

Visually - not much of anything.
Some will argue there is some optical difference depending on facets involved if you want to go down a huge rabbit hole.
These days EX/ID is generality expected for rounds just because so many of them get it.
Fancies vg is much more common and expected.

 

[LittleKite]

As a customer, for stones smaller than 1ct and with lower clarity such as SI, I am willing to accept VG polishing. Otherwise I will stay with EX polishing.

 

[Gemly]

CA 36 PA 40.3 is similar to CA 34.5 PA 40.6 .
To it can not has a big head obscuration.

Hi Serg! Thanks for the reply! Are you saying that both of those specs do sometimes and also in some cases do not have head obstruction issues?

 

[Gemly]

1.01 Carat round diamond

This 1.01 carat round diamond K color vs2 clarity has Very Good proportions and a diamond grading report from GIA

www.jamesallen.com

This is probably close to 40PA/40CA

1. Notice small table reflection and the arrows shafts taking over the table. Your 36 CA /40.3 PA is not as dramatic, but it definitely has a small table reflection and long arrows compared to ideal cut diamonds.
2. I do not have hands-on experience with 36/40.3. So cannot answer about obstruction and viewing distance in detail. I know 35/40.5 requires some viewing distance, not quite arms length
3. You just need to look at thousand of videos and photos and teach yourself. Start with modified cushion brilliant and radiant, then princess, oval, hearts, OEC. The MRB is the hardest to see leakage without ASET, especially when the proportions are within or close to the recommended ranges. Plus, you really need well taken videos and photos. JA and WF are good. BN videos are a bit difficultt. Step cuts are another different topic. Facets with strong light return and leaky facets just look different. See the JA stone I linked. You can see this stone has almost no leakage. It is reflecting white light, hiding its brown body color very well, despite the proportions no where close to the recommended ranges.

Lastly, I am not liking this 36/40.3. The pavilion and arrows are a bit uneven and wonky. There are some spots I cannot tell if it is leakage or light return. Regardless, still better than many steep deep GIA Ex with HCA score of 3.0 or higher.

CA 36 PA 40.3 is similar to CA 34.5 PA 40.6 .
To it can not has a big head obscuration.

Visually - not much of anything.
Some will argue there is some optical difference depending on facets involved if you want to go down a huge rabbit hole.
These days EX/ID is generality expected for rounds just because so many of them get it.
Fancies vg is much more common and expected.

As a customer, for stones smaller than 1ct and with lower clarity such as SI, I am willing to accept VG polishing. Otherwise I will stay with EX polishing.

You are all so amazing. I am so thankful and grateful to have your help! Thank you so much for taking your time to educate and help me with this process.