FIC vs BIC

[Iowa Lizzy]

I''m not in the market for a new diamond right now, but I was browsing the tutorials for a refresher course and I became curious about fiery ideal cut diamonds versus brilliant ideal cut.

Are most of the diamonds we see today BIC or FIC? The diamond my fiancé purchased (link here) came with a Gemex BrillianceScope report and it looks like there is more "fire" than "brilliance" in my diamond. Would that make it an FIC?

I''m just curious if anyone could explain the difference to me a little more than what I got from the tutorial. Is there a simple equation to determine if a diamond is BIC or FIC?

 

[yssie]

I believe the HCA standards are BIC 35.5 with appropriate pavilions.




ETA: I really think you can see a difference in performance type, however you label it. I had a shallower stone, now I have one with a steeper crown - visible difference in colour output!


ETA: Also a visible difference in "bright white dot" effect - esp. in low light - the old stone shone like a little mirror, the new one is much more muted.

 

[Dreamer_D]

Most diamonds that are recommended on PS would fall into the TIC range on the HCA, which means they balance fire and brilliance.

As far as I know, the labels BIC and FIC have to do with particular angle combinations, but I would be curious to know about your Gemex results too.

Where does your diamond fall on the HCA?

 

[Iowa Lizzy]

Date: 1/22/2010 11:11:15 PM
Author: dreamer_dachsie
Most diamonds that are recommended on PS would fall into the TIC range on the HCA, which means they balance fire and brilliance.


As far as I know, the labels BIC and FIC have to do with particular angle combinations, but I would be curious to know about your Gemex results too.


Where does your diamond fall on the HCA?

My diamond gets a nasty score on the HCA. I posted asking for answers when my FI originally put the stone on hold and was told that the stone has a very "tight cut" and the HCA doesn't really like the proportions. The link to that thread is here. So unfortunately, I'm not sure if the HCA can answer what type of diamond it is.

What does "TIC" stand for?

 

[Dreamer_D]

Tolkowsky Ideal Cut.

https://www.pricescope.com/wiki/diamonds/tolkowsky-ideal-cut-diamond/

ETA fixed spelling

 

[Dreamer_D]

Date: 1/22/2010 11:19:51 PM
Author: Travel Goddess

Date: 1/22/2010 11:11:15 PM
Author: dreamer_dachsie
Most diamonds that are recommended on PS would fall into the TIC range on the HCA, which means they balance fire and brilliance.


As far as I know, the labels BIC and FIC have to do with particular angle combinations, but I would be curious to know about your Gemex results too.


Where does your diamond fall on the HCA?

My diamond gets a nasty score on the HCA. I posted asking for answers when my FI originally put the stone on hold and was told that the stone has a very ''tight cut'' and the HCA doesn''t really like the proportions. The link to that thread is here. So unfortunately, I''m not sure if the HCA can answer what type of diamond it is.

What does ''TIC'' stand for?

Well your crown doesn''t fall into the FIC range that Yssie posted...

 

[Dreamer_D]

I just wantched the video that Jon made for you... I don''t think your diamond would be an FIC, based on my admittadly limited knowledge of the class. It looks very bright in the indirect light, as bright as the other diamonds in the vid, and FICs are supposed to suffer in brilliance. It also looks as firey as the others in the spot lighting. It seems pretty balanced to me!

Its a gorgeous rock, though, I am super jealous

 

[yssie]

Ditto - it does look like a really pretty stone

very balanced!

 

[Iowa Lizzy]

Thanks dreamer and yssie! Maybe it''s just older cut diamonds like OECs that generally fall into the FIC category? I''m just always looking at my diamond in different lighting and I''m amazed at how colorful it can be. I think I just wasn''t expecting any fire.

I forgot how much fun it is learning about diamonds. Even if I''m not in the market for one right now. Oh, and thank you for the compliments on my stone. I''m very proud of it.

 

[ChunkyCushionLover]

Date: 1/22/2010 11:32:46 PM
Author: dreamer_dachsie
I just wantched the video that Jon made for you... I don''t think your diamond would be an FIC, based on my admittadly limited knowledge of the class. It looks very bright in the indirect light, as bright as the other diamonds in the vid, and FICs are supposed to suffer in brilliance. It also looks as firey as the others in the spot lighting. It seems pretty balanced to me!

Its a gorgeous rock, though, I am super jealous

This thread missed out on the most important thing the Ideal Cut part!
Fiery Ideal Cut, Brilliantancy Ideal Cut.
FIC has plenty of brilliance and BIC has decent fire as well, however each has its stengths and weaknesses but well cut versions of these combinations of the stones are excellent performers. These are suttle differences unlike the difference between an HCA 4.5 and HCA 1.9 stone in terms of cut.

 

[Lorelei]

Date: 1/22/2010 11:03:40 PM
Author:Travel Goddess
I'm not in the market for a new diamond right now, but I was browsing the tutorials for a refresher course and I became curious about fiery ideal cut diamonds versus brilliant ideal cut.

Are most of the diamonds we see today BIC or FIC? The diamond my fiancé purchased (link here) came with a Gemex BrillianceScope report and it looks like there is more 'fire' than 'brilliance' in my diamond. Would that make it an FIC?

I'm just curious if anyone could explain the difference to me a little more than what I got from the tutorial. Is there a simple equation to determine if a diamond is BIC or FIC?

Hi travelgoddess,

Your diamond falls within tolkowsky ideal cut range, the slightly steeper pavilion angle is penalizing the HCA score. However you have no need to worry, the images are excellent and you have a beautiful stone!

For those reading, here is a basic overview of the various diamond types, FIC, TIC, BIC.

This link explains more concerning Brilliant Ideal Cut and Fiery Ideal Cut. Normally here what we call " Near Tolkowsky" cuts ( aka TIC's) are very popular as they offer a good balance of fire, brilliance and scintillation etc.

It can be a trade off with FIC or BIC as to which you choose. Below is a basic overview of both types, see the link above for proportion guides.

FIC - fiery ideal cuts have their fans, these can be beautiful diamonds which can show enhanced fire if the lighting is right. The trade off can be with these that they can sometimes have extra depth, thicker girdles and can hold weight in the crown due to the proportion configuration. Extra physical depth can be acceptable in the fiery ideal cut.

BIC - can be very bright and brilliant stones as the name implies. These can have larger tables, shallower crown angles and sometimes look large for the weight - watch for very thin girdles along with crown angles below 32.5 degrees to avoid potential durability issues. These types of stones definitely have their supporters too, the trade off here is that fire or coloured light can be down somewhat. Depending on the overall proportions, these can also make excellent pendant or earring stones.

Bear in mind whichever type of diamond you choose, the differences can be subtle, its not a tremendous visual difference to me at casual or first viewing especially.

 

[tyty333]

Date: 1/22/2010 11:19:51 PM
Author: Travel Goddess

Date: 1/22/2010 11:11:15 PM
Author: dreamer_dachsie
Most diamonds that are recommended on PS would fall into the TIC range on the HCA, which means they balance fire and brilliance.


As far as I know, the labels BIC and FIC have to do with particular angle combinations, but I would be curious to know about your Gemex results too.


Where does your diamond fall on the HCA?

My diamond gets a nasty score on the HCA. I posted asking for answers when my FI originally put the stone on hold and was told that the stone has a very 'tight cut' and the HCA doesn't really like the proportions. The link to that thread is here. So unfortunately, I'm not sure if the HCA can answer what type of diamond it is.

What does 'TIC' stand for?

I got a 1.7 HCA when I ran your stone from the numbers on the gog website. You said you got over 2?
Edit - it said it is TIC.