Diamond measurements

[Dee100]

I bought a round diamond ring with these measurements
Table 58%
Depth 61.5 %
Crown angle 32
Crown height 13%
Pavilion depth 44.5 %
Pavilion angle 41.8
Girdle to culet 75%
Star 55%
Do these sound good?
1 carat measurements 6.41x 6.46x 3.96mm

 

[Kim N]

You can run it through the HCA.

Holloway Cut Advisor | HCA Tool

The HCA Tool uses data from a round brilliant diamond to produce a score that can help you make an estimate regarding the cut quality. Use it here.

www.pricescope.com

 

[Dee100]

I bought a round diamond ring with these measurements
Table 58%
Depth 61.5 %
Crown angle 32
Crown height 13%
Pavilion depth 44.5 %
Pavilion angle 41.8
Girdle to culet 75%
Star 55%
Do these sound good?
1 carat measurements 6.41x 6.46x 3.96mm

Not able to check HCA. Does not show results and asks me to enter some key?

 

[maryjane04]

Lucky I don't use the hca tool very often but here it is.. reject!

 

[Dee100]

Lucky I don't use the hca tool very often but here it is.. reject!

Wow! I'm surprised to see this score. The diamond shines and sparkles so well.

 

[Dee100]

Lucky I don't use the hca tool very often but here it is.. reject!

I'm hoping the report is for a different diamond lol. It even sparkles in low light. So confused

 

[DejaWiz]

Wow! I'm surprised to see this score. The diamond shines and sparkles so well.

Well, the HCA is a bulk rejection tool for vendors/shoppers of ideally cut and proportioned diamonds looking to narrow down a big list of into a smaller list of potential candidates. Since it isn't a selection tool, each diamond left on the short list should still be individually vetted for symmetry, clarity/transparency, light return, and light leakage. The HCA does have some limitations for the calculations that it performs and the results that it produces.

There are a couple huge stand-outs with your diamond that warrant concerns, leaving me with questions that need answers:

1. The very steep 41.8° PA
2. The quite shallow 32° CA

If light leakage turns out to not be a concern (verified with an ASET or Ideal-Scope), then I would conclude that this diamond would be geared towards brilliance over fire.

 

[Kaycee2018]

Wow! I'm surprised to see this score. The diamond shines and sparkles so well.

Were you viewing it in jewelry store lighting? That lighting is specifically designed to make even poorly cut diamonds look good. Diamonds need to be viewed in various real life lighting situations to get a feel for how they will perform under normal circumstances in day-to-day life. Jewelry store lighting is trickery.

 

[Dee100]

Interesting. I wish I could get asset scope i don't know how
This diamond is VVS1

 

[kenny]

Interesting. I wish I could get asset scope i don't know how
This diamond is VVS1

ASET Scope

ASET is like the Ideal Scope but gives more detailed information. It is best for analyzing fancy shaped diamonds.

www.pricescope.com

This link has info about ASETs.
It also has this link, where you can buy one.

HOW TO USE IDEAL-SCOPE PRODUCTS - Ideal Scope

ideal-scope.com

BTW good light performance is not the result of high clarity and color.
It depends on the cut itself (the recipe if you will) that determines whether the light is going to leak out the bottom and sides or reflect of the bottom and sides and then return out the top, to your eyes.

If that HCA 4.8 looked good imagine how much better an HCA under 2 will look.
And yes, the lighting can make or break the color, fire and scintillation of any diamond - well or poorly cut.

Even the best-cut diamond in the world will have no colored rainbow fire if the light source is soft diffuse and directionless, like a cloudy day outside.

The enjoy the best light performance you need both good cut and advantageous lighting, like in an elevator with a black ceiling with a few tiny halogen spot lites in it.
Under a sunny sky but under a shady tree with leaves that let little shafts of light through on a breezy day also produces a beautiful diamond light show.

The proportions that result in the best performance require that more rough diamond material is polished away and lost.
Most diamonds are cut for maximum carat weight, NOT for the best light performance.
Why?
Because few buyers understand light performance depends on cut, but everyone understands carat weight.

 

[Diamond_Enthusiast]

Interesting. I wish I could get asset scope i don't know how
This diamond is VVS1

Agree with this comment below:

BTW high clarity and color have nothing to do with a diamond's light performance.
It's the cut itself (the recipie if you will) that determines whether the light is going to leak out the bottom and sides or be returned out the top to your eyes.

High clarity/color doesn't automatically mean good light performance!

Think of a diamond like mirrors reflecting light. The cut is what determines the angles of how these 'mirrors' are placed and thereby the way light is returned back to your eyes.

Cut is the key driver of the sparkle you see.

 

[Dee100]

Thanks for info.
I think i need to stop buying from Costco then. Quality is good but no way to check proportions till you buy. Very frustrating..
The stores i will need to search for now.

 

[kenny]

... I think i need to stop buying from Costco then. Quality is good but no way to check proportions till you buy. Very frustrating. ...

While true for lower-priced stones, some of Costco's more expensive online diamonds list the number of the GIA Report.
Enter that number into GIA's Report Check website to get proportions of rounds.
All other cuts show fewer proportions, but the HCA is only for rounds anyway.

On Costco's jewelry site, look for "One of a Kind Rings" ...











Then click on one of the ring listings to get its GIA grading report number ...











Enter that number into the Report Check at GIA's website ...

GIA - Report Check

www.gia.edu

Here's the first screen you'll see after entering report # ...

All the proportions needed by the HCA are at the bottom, but if you want to see the GIA report itself click on DOWNLOAD PDF.









Here's the report..

 

[Dee100]

Yeah but the non one of a kinds don't give GiA and each diamond has to be bought to review it.

 

[kenny]

Yeah but the non one of a kinds don't give GiA and each diamond has to be bought to review it.

You're welcome.
Frankly I'd buy from Whiteflash, not Costco.