60:60 vs Ideal MRB proportions – Is beauty in the eye of the beholder? Can one cut fit all?

[Serg]

Hi Bryan,
....
At this point in time, I do not believe there's an accurate method for measuring scintillation.

I would also bring up my oft repeated point about fire, and facet size.
That is to say, measuring fire independent of facet size- and not related to other diamond cuts- from my perspective, is confusing the issue.
What about a comparison of actual fire events in two diamonds cut to the same proportions , one 4 ct, the other .50ct.
Let's also measure fire for fire between an OMB and a RBC, same carat weight. If fire is a main goal.
.....

See below the difference in sorting by absolute value Fire and relative to size

1) Absolute Fire value


2) by Carat

 

[Serg]

Bryan, we're combining "mathematical models" and "intrinsic potential"
To me, this means the mathematical model is just taking a stab at what might be. it will depend on lighting and other factors.
Even so, can you provide a comparison between two stones of same cut, different ct weights?

In terms of the rotating videos, I disagree.
They have value, without a doubt, but not so much for real world fire, and scintillation.
People never rotate diamonds in a perfectly symmetrical pattern and the lighting in the boxes taking the rotating video needs to be far more stable/ repeatable than real world lighting.
I view them as more "glamor" shots.

Is 24 Hours of Le Mans "glamor" racing? if Yes, how is about "Paris–Dakar Rally"?
there is not any problem to use any stable 2D trajectory to score Fire.

The main problem to start use Fire, Brilliancy scores is not technical issue .
its are "traditional diamond industry problems". there are not big enough innovated community in diamond industry. There not many young and well educated persons in retail . Industry is not ready yet for risk, for changes .

 

[Karl_K]

Serg, When there is big money in innovation then there will be innovation. Today as it was yesterday, a huge part of the industry is flipping stones to people who don't really want to buy one but feel they are expected to do so. Selling innovation in that market is not an easy sell. Making it easy and safe feeling sells.

 

[boryanastamenova]

Hi all,

I’m wondering if anyone could comment on these specs. Unfortunately, I do not have any images.

.98 carats, color H, clarity VVS2
MEASUREMENTS 6.44 - 6.47 x 3.86 mm
FLUORESCENCE: None
TOTAL DEPTH PERCENTAGE 59.8%
TABLE SIZE PERCENTAGE 59%
CROWN HEIGHT PERCENTAGE 13.6%
CROWN ANGLE 33.7°
PAVILION DEPTH PERCENTAGE 43.1%
PAVILION ANGLE 40.7°
GIRDLE THICKNESS Medium to Slightly Thick
GIRDLE FINISH Faceted
CULET None
LOWER HALF LENGTH PERCENTAGE 74.0%
STAR LENGTH PERCENTAGE 56.0%

 

[Karl_K]

@boryanastamenova please start your own thread, this one is 5 years old.
the numbers look ok.

 

[Garry H (Cut Nut)]

Hi all,

I’m wondering if anyone could comment on these specs. Unfortunately, I do not have any images.

.98 carats, color H, clarity VVS2
MEASUREMENTS 6.44 - 6.47 x 3.86 mm
FLUORESCENCE: None
TOTAL DEPTH PERCENTAGE 59.8%
TABLE SIZE PERCENTAGE 59%
CROWN HEIGHT PERCENTAGE 13.6%
CROWN ANGLE 33.7°
PAVILION DEPTH PERCENTAGE 43.1%
PAVILION ANGLE 40.7°
GIRDLE THICKNESS Medium to Slightly Thick
GIRDLE FINISH Faceted
CULET None
LOWER HALF LENGTH PERCENTAGE 74.0%
STAR LENGTH PERCENTAGE 56.0%

Very bright proportions but the 74 and 56% are unusual. We need Karl

 

[Karl_K]

I was going to wait for a new thread but its my bed time.
The numbers add up to a bit of an odd duck.
It is an odd duck combo however that when cut reasonably well can work very well.