BIC, FIC, and HCA

[kmoro]

Hello All!

Is there anyone out there that prefers a BIC to FIC? It seems that everyone suggesting stones here goes for the FIC ... and I see that FIC is harder to find, at least to me.

Does an increase in one necessarily mean a decrease in the other? Can there be a balance of both or would that just mean the diamond has less of both?

In respect to the HCA, I notice that it still predicts excellent fire even when the table size is larger (example 60) and/or the crown angle is lower (example 32) - the conditions under which PSers say there will be more white light return.

I suppose it boils down to personal preference, but again, it seems that the experts here are all about fire. I have seen the odd layperson pop up and say that they prefer more white light return, but they were in that position of defending a decision to go with a 60/60 stone.

If it’s all about fire, why isn’t everyone buying moissanite? But now I’m getting carried away, lol.

Thoughts?

 

[Paul-Antwerp]

I think the entire theory about BIC, FIC as it is incorporated into HCA should be removed. I would suggest disregarding it completely.

Live long,

 

[rockhoundofficiando]

and prosper...

"If it’s all about fire, why isn’t everyone buying moissanite?"

Hello! It could be because this is a diamond and gemstone lover's site and moissanite is an artificial, created diamond simulant stone. There are plenty of posts about it in the Fashion jewelry forum if you're interested.

 

[Matilda]

I'm sorry but I can't figure out what the abbreviations BIC and FIC mean. Would anyone care to explain please?

 

[rockhoundofficiando]

Brilliant ideal cut and fiery ideal cut.

 

[Matilda]

thank you! are either (or even both) connected to "hearts and arrows" ?

 

[Karl_K]

thank you! are either (or even both) connected to "hearts and arrows" ?

Most h&a diamonds fall with in the Tolkowsky Ideal Cuts (TIC) range.
Some info here:
http://www.diamond-cut.com.au/23_bicfic.htm

 

[OoohShiny]

I think the entire theory about BIC, FIC as it is incorporated into HCA should be removed. I would suggest disregarding it completely.

Hi Paul

IIRC I read a post that said CBI cutting techniques are able to produce high amounts of fire without the high crown / small table combinations that are usually mentioned on this forum as being good for creating the opportunity for fire, so if that is correct, I can appreciate where you're coming from.

However, is it not true to say that generally speaking the high crown / small table combination would tend to be more 'FIC' than 'BIC', with 'BIC' being lower crown / larger table / possibly a 60/60 style?

(I ask not to be contrary, but to try to increase my understanding )

 

[Matilda]

thank you @Karl_K ! I also found a few other old threads which helped understand a bit

 

[Karl_K]

My Wifey4vr's first diamond I bought her would most likely qualify as a fic.
I picked it out by eye pre-pricescope at a pawn shop.
Many years later the ASET image looked good.
I still love it :}

I would not be against hunting down more like it and the hca helps doing that.

 

[kmoro]

and prosper...

"If it’s all about fire, why isn’t everyone buying moissanite?"

Hello! It could be because this is a diamond and gemstone lover's site and moissanite is an artificial, created diamond simulant stone. There are plenty of posts about it in the Fashion jewelry forum if you're interested.

I was asking a question about diamonds on the diamond forum and was joking about the moissanite. Thank you for your contribution, though.