bic, fic and tic and earrings:

[strmrdr]

Earrings are often looked at off axis ie not strait on unless someone is standing off center of the person wearing them.
These image are direct lighting at 45 degree angle wich isnt unrealistic with earrings.

disclaimer: while I have tried a few different combos in each group with the same results this may not hold true for all combos.

disclaimer part2: only partialy verified with real diamonds and is a work in progess, do not take it to seriously at this time :}
Presented for discussion only.

Fic with the best off axis light return

 

[strmrdr]

Bic which is in the middle on off axis performance

 

[strmrdr]

Tic which is least suited for earrings.

 

[strmrdr]

What was shocking to me is I expected it to go FIC, TIC, BIC not FIC, BIC, TIC.

 

[strmrdr]

disclaimer: while I have tried a few different combos in each group with the same results this may not hold true for all combos.

disclaimer part2: only partialy verified with real diamonds and is a work in progess, do not take it to seriously at this time :}

 

[strmrdr]

aset images 45 degrees tilt.

FIC

 

[strmrdr]

BIC

 

[strmrdr]

TIC

 

[Garry H (Cut Nut)]

Interesting Storm.

I would still go for a shallower proportion set with earrings - try some shallow BIC''s and FIC''s?
Say like 57% 33 40.5 and 54% 36 40

 

[strmrdr]

ASET rates them BIC, FIC , TIC at 45 degree tilt.

 

[aljdewey]

Date: 10/17/2005 7:23:17 PM
Author:strmrdr
Earrings are often looked at off axis ie not strait on unless someone is standing off center of the person wearing them.

True, but earrings aren''t viewed in a static position either.

One''s head moves while talking, especially in groups. I noticed it very much when I was sitting with Mara and John Q. during my visit at WF.

We had stopped to grab coffee, and we were sitting near the windows. The flashes coming from Mara''s earrings were mesmerizing.

 

[strmrdr]

Why does aset rate them differenty?
The bic has more intence light return in some areas, the FIC has less dark areas and looks bigger because the light return goes out more towards the edge.

 

[strmrdr]

Date: 10/17/2005 8:00:27 PM
Author: aljdewey

Date: 10/17/2005 7:23:17 PM

Author:strmrdr

Earrings are often looked at off axis ie not strait on unless someone is standing off center of the person wearing them.

True, but earrings aren''t viewed in a static position either.


One''s head moves while talking, especially in groups. I noticed it very much when I was sitting with Mara and John Q. during my visit at WF.


We had stopped to grab coffee, and we were sitting near the windows. The flashes coming from Mara''s earrings were mesmerizing.

Your jumping ahead in the program a little.
But your 100% currect.
All 3 are bright enough and have enough contrast to throw sparks.

 

[valeria101]

Isn''t this called ''tilt brilliance'' ?

Haven''t heard about that in a while...


There is a tiny bit of a refference to it at Good old Gold on their page about pairing Star and lgf length on H&A. But I don''t think the word tilt brilliance is used. And a bit more on faceters.com - actually, some of the unusual fancy cuts for GemCad and colored stones posted there take tilt brilliance to hart - and this is allot said for low RI. For diamonds, the same feat comes by default, almost. I am not si sure what it may mean for relatively low crown heights - there isn''t much room to look into those stones while tilted anyway.

Oh well.

whatever these things might mean.

 

[strmrdr]

Val gets a gold star :}
It is indeed tilt brilliance.
And yes it even applies to diamonds but not to the huge extent it does with other materials.
I havent heard it talked about much either, it is actualy thinking about talking a while back about tilt brilliance with Micheal E on a gemstone design that brought me to look into it with different combos.
As with most things it got put on the back burner for months and is just now getting worked on.

 

[Cind11]

OK, what does TIC, BIC and FIC mean? I''m sure I''ll feel silly once I find out but...

 

[strmrdr]

Tolkowsky ideal cut == tic:
http://diamonds.pricescope.com/tolk.asp

brilliant ideal cut == bic == cut for increased brillance.
fiery ideal cut == fic == cut for increased fire

The only silly questions are ones that when you really want to know and dont ask.

 

[strmrdr]

Date: 10/17/2005 7:56:09 PM
Author: Garry H (Cut Nut)
Interesting Storm.


I would still go for a shallower proportion set with earrings - try some shallow BIC's and FIC's?

Say like 57% 33 40.5 and 54% 36 40

33 40.5 54 is better than 33 40.5 57


edit: 54% 36 40 is too dark a combo from on axis.

 

[strmrdr]

33 40.5 57

 

[Mara]

are you in the market for a pair of diamond earrings, strm?

 

[belle]

my earrings don''t look like that... from any angle!

 

[strmrdr]

Date: 10/17/2005 10:23:16 PM
Author: Mara
are you in the market for a pair of diamond earrings, strm?

nopers just bored.

 

[strmrdr]

Date: 10/17/2005 10:26:19 PM
Author: belle
my earrings don''t look like that... from any angle!

How would you know unless your eyes were on stalks :}

 

[belle]

Date: 10/17/2005 11:17:04 PM
Author: strmrdr

Date: 10/17/2005 10:26:19 PM
Author: belle
my earrings don''t look like that... from any angle!

How would you know unless your eyes were on stalks :}

i am not totally narcissistic but i''ll admit, i have looked in the mirror on more than one occasion. handy those reflections are.

 

[Garry H (Cut Nut)]

Date: 10/17/2005 9:29:52 PM
Author: strmrdr

Date: 10/17/2005 7:56:09 PM
Author: Garry H (Cut Nut)
Interesting Storm.


I would still go for a shallower proportion set with earrings - try some shallow BIC''s and FIC''s?

Say like 57% 33 40.5 and 54% 36 40

33 40.5 54 is better than 33 40.5 57 then make the lower girdle facets a bit longer to match the smaller table and shallower pavilion Storm.


edit: 54% 36 40 is too dark a combo from on axis. same thing - try 85% lower girdles. And 55% upper girdles.

Remeber that no one can see these diamonds from closer than 18 inches (without risking a black eye). so the normal rules for head obstrucion do not apply. So face up darkness rules should change.

 

[strmrdr]

Will look into it Garry,
From the looks of it im coming to agree with you that shallow pavillion diamonds are better for earrings.
It looks like smaller tables may also help.

 

[strmrdr]

Date: 10/17/2005 11:38:02 PM
Author: belle

Date: 10/17/2005 11:17:04 PM

Author: strmrdr

Date: 10/17/2005 10:26:19 PM

Author: belle

my earrings don''t look like that... from any angle!

How would you know unless your eyes were on stalks :}

i am not totally narcissistic but i''ll admit, i have looked in the mirror on more than one occasion. handy those reflections are.

ah yes a mirror.
just for the kicks I took my diamond and my cz''s and compared the relections created by mirrors and compared it to actualy looking at them and there is a big difference.
expecialy at longer distances like 2-3 feet from the mirror.
Keep in mind my disclaimers and have fun.
You have DC why not play with some different combos, you might learn some stuff and have fun doing it.
The same old same old gets boring.