Back with a question (previous stone 6.2 HCA)

[skimaster08]

So last night I posted a stone thinking it was going to be a slam dunk....boy I was wrong....seems I set a weekly high HCA score of 6.2 haha.

I talked with a new jeweler who understood my frustration and said he was going to look for actual good stones. I got a call five minutes ago and he has a 1.4 HCA, woot!

Since you were all so helpful last time I was hoping to get your thoughts.

https://www.gia.edu/report-check?reportno=6235112392

ROUND BRILLIANT

Measurements
7.01 - 7.03 x 4.23 mm
Carat Weight
1.28 carat
Color Grade
G
Clarity Grade
SI1
Cut Grade
Excellent
PROPORTIONS

Depth
60.3 %
Table
60 %
Crown Angle
33.0°
Crown Height
13.0%
Pavilion Angle
41.0°
Pavilion Depth
43.5%
Star Length
50%
Lower Half
80%
Girdle
Slightly Thick, Faceted, 4.0%
Culet
None


Thanks again!

 

[Sillysarah84]

I'm not an expert but this diamond is known as a 60/60 diamond. 60% depth and 60% table. They have been pretty extensively debated here on pricescope. I really like the look, but it's my understanding that you lose some "fire" because of the proportions. I believe they are also cheaper than the ideal proportions.

 

[Tophat1]

Yes, they are not my cup of tea because I love fire. CA is low and PA is high on this one

 

[skimaster08]

Yes, they are not my cup of tea because I love fire. CA is low and PA is high on this one

What is CA and PA? Sorry for my ignorance

 

[LLJsmom]

Crown angle
Pavilion angle

 

[skimaster08]

Crown angle
Pavilion angle

Are my angles bad?

 

[bmfang]

skinmaster, your previous stone at least showed up on the HCA tables. I'm currently looking at the website for an upcoming diamond auction here in Australia and a couple of the stones, the HCA can't even plot on the picture as the angles are really out there (one of them has a 29.5 deg crown angle coupled with a 43.2 deg pavilion angle!)

 

[foxinsox]

They're not bad per se but the 60:60 type of diamond favours white light/brilliance over fire. So it'll likely be a white bright stone but not a fiery one. They do usually have a good spread.
Have you seen the stone in person yet? It has potential. Since your jeweller is being accomodating, ask him to see if he can find one that will favour fire and compare them to see what you like.

 

[purplesilk]

I'm not an expert, but I recently got some diamonds of comparable ct, all F color, one IF, the others VVS:two of them have the perfect Pricescope standard measurements, four of them are 60/60...I prefer the 60/60 because of their exceptional brilliance and good spread.
If I see a stone with fire prevaling over brilliance I'm inclined to assume it is a cz or a moissanite...

 

[skimaster08]

skinmaster, your previous stone at least showed up on the HCA tables. I'm currently looking at the website for an upcoming diamond auction here in Australia and a couple of the stones, the HCA can't even plot on the picture as the angles are really out there (one of them has a 29.5 deg crown angle coupled with a 43.2 deg pavilion angle!)

Hey I guess I no longer hold the record haba

 

[skimaster08]

Hey guys got another stone for review (which I think favors the fire side of things):

GIA 6245407829 (https://www.gia.edu/report-check?reportno=6245407829)
HCA - 1.8
Round Brilliant

Measurements
Diamond dimensions listed as “minimum diameter – maximum diameter x depth” for round diamonds and “length x width x depth” for fancy-shaped diamonds.

6.83 - 6.87 x 4.28 mm
Carat Weight - 1.25 carat
Color Grade - G
Clarity Grade - VS2
Cut Grade - Excellent
proportions

Depth -62.4 %
Table - 56 %
Crown Angle - 36.0°
Crown Height - 16.0%
Pavilion Angle - 40.6°
Pavilion Depth - 42.5%
Star Length - 50%
Lower Half - 70%
Girdle - Medium to Slightly Thick, Faceted, 3.5%
Culet - None


Thoughts?

 

[msop04]

Can you view both stones side by side? I happen to like the look of a 60/60 stone, and I love the spread... you should see them to compare.

 

[skimaster08]

Yes the same guy has them, I am going to see them tomorrow actually

 

[skimaster08]

Can you view both stones side by side? I happen to like the look of a 60/60 stone, and I love the spread... you should see them to compare.

The inclusion, i.e. the cloud doesn't make you nervous?

 

[msop04]

The inclusion, i.e. the cloud doesn't make you nervous?

No... for the simple fact that I can't see the diamonds -- but you can. LOL You'll need to use your eyes and not only rely on the inclusion plot.

 

[skimaster08]

No... for the simple fact that I can't see the diamonds -- but you can. LOL You'll need to use your eyes and not only rely on the inclusion plot.

Hahaha great point

 

[gm89uk]

Please inspect the newest stone closely (1.25 G,VS2) and check it doesn't go too dark under the table if you hold it close or inspect it close (it may not do in the jewellery store). LFG 70% not preferable with 36% crown.

 

[skimaster08]

They're not bad per se but the 60:60 type of diamond favours white light/brilliance over fire. So it'll likely be a white bright stone but not a fiery one. They do usually have a good spread.
Have you seen the stone in person yet? It has potential. Since your jeweller is being accomodating, ask him to see if he can find one that will favour fire and compare them to see what you like.

can you take a look at the stone he just got in? I think it will be a good comparison as it favors fire

 

[foxinsox]

I'm not good with MRBs (prefer old cuts) but as long as it's inside the preferred ideal parameters you should be looking at good light return.

Here’s the cheat sheet for rounds (compiled from various PS experts)
depth – 60 – 62%
table – 54- 57%
crown angle – 34- 35 degrees
pavilion angle – 40.6- 41 degrees
girdle – thin to slightly thick, thin to medium, etc (avoid very thin or thick)
polish and symmetry – very good and above

note – with crown and pavilion angles at the shallower ends ( CA 34- PA 40.6) and steeper ( CA 35- PA 41) check to make sure these angles complement in that particular diamond – eyeballs, Idealscope, trusted vendor input – check as appropriate!

I found this somewhere in the forums which should help since I think TIC (Tolkowsky ideal cut) favours fire:
With that said, here”s a “Cliff”s Notes” for staying near Tolkowsky/ideal angles with GIA reports (their numbers are rounded): A crown angle of 34.0, 34.5 or 35.0 is usually safe with a 40.8 pavilion angle. If pavilion angle = 40.6 lean toward a 34.5-35.0 crown. If pavilion angle = 41 lean toward a 34.0-34.5 crown.

Remember trust your eyes cos you have to look at it but make sure you're looking in as many different lights as you can not just perfect store lighting