Teach Me!

[snaphappy]

I have so many questions!! But AI is not really answering this one. So here goes.

On the internet, when I’m looking at brilliant round (assuming no leds are present) I see a lot of black, a lot of blue maybe, sometimes just in the center, sometimes the entire diamond.

Keep in mind, our diamonds are both in that j-m range, one is OEC and the other is transitional, both have culets.

So in the RBC am I seeing spears, or hearts and arrows?
Am I seeing D-I color and my eye is interpreting that as blue?
Am I seeing scintillation? And maybe old cuts like ours don't have scintillation because we don't have spears, or hearts and arrows?
Am I noticing this simply because the RBC has a MUCH bigger table than our diamonds?
Oh another question, does a culet stop this from happening?

 

[Karl_K]

Many of the colors in 360 video are enviromental.
Blue from shirts or uniforms is very common as is brown and yellow.

Many sites use a still shot of the 360vid for the static picture.

 

[snaphappy]

Ok they're not called spears. You guys call them arrows? I think the larger table allows me to see the arrows. And the arrows look black to me. I’m guessing the arrows are there in my wife’s transition cut, but maybe I can’t see them because the table is so small? Or the culet keeps me from seeing them? Or maybe both?

Here’s a video. Without perfect led lighting, all RBC diamonds look black and dark to me…

 

[Karl_K]

This might help you understand the difference between an oec and mrb.

Do the pavilion mains drive light return in the modern round brilliant?

Article by Karl K. On many websites you will see it said that the pavilion main facets drive light return. Top labs and many grading systems use the pavilion angle […]

www.pricescope.com

 

[Karl_K]

This in particular.

The reflection of the facets in red are the arrows. (pavilion mains)
In the oec they are the entire under table area.
They are cut to react to obstruction more in a modern RB than a cut for a ring oec or transitional.
If an oec reacted to obstruction and many do the same as modern RB they would appear dark in a ring at some distances.
However in a tiara or pendant they would be awesome.
The viewing distance is what changes and makes the difference.
Many videos are the same as viewing the diamond at 4-5 inches from your eye so obstruction is not representative.

 

[Garry H (Cut Nut)]

This in particular.

The reflection of the facets in red are the arrows. (pavilion mains)
In the oec they are the entire under table area.
They are cut to react to obstruction more in a modern RB than a cut for a ring oec or transitional.
If an oec reacted to obstruction and many do the same as modern RB they would appear dark in a ring at some distances.
However in a tiara or pendant they would be awesome.
The viewing distance is what changes and makes the difference.
Many videos are the same as viewing the diamond at 4-5 inches from your eye so obstruction is not representative.

Excellent explanation Karl!

 

[snaphappy]

I'm kinda slow. So bigger table = bigger obstruction? So my head is obstructing the light... and the table is bigger on the RBC... so it looks like a bigger dark area?

So if I view an RBC from across the room, with no obstruction, it will look magical? Interesting!

If I understand all of this correctly, it's perplexing that RBC dominates wedding rings. Hand is the only jewel you can obstruct so it seems like an odd place to put an RBC

 

[Karl_K]

I think your confusing video appearance with real world appearance.
In the video shown its a lighting issue not a diamond issue.
Someone would have to work very hard to ever see that diamond look like that to the bare eye.

A well cut RB has balanced contrast up close at a reasonable distance and not over responsive to obstruction at extended distances which makes them look less bright.
It is a balance.

 

[snaphappy]

I think your confusing video appearance with real world appearance.
In the video shown its a lighting issue not a diamond issue.
Someone would have to work very hard to ever see that diamond look like that to the bare eye.

A well cut RB has balanced contrast up close at a reasonable distance and not over responsive to obstruction at extended distances which makes them look less bright.
It is a balance.

Maybe your right! I’ve never had one on my finger. Ok I need try one on haha