Performance and the p3 facets, a discussion about step cut diamonds.

There is a new article on Pricescope journal by Karl K ( strmrdr ).

Performance and the p3 facets, a discussion about step cut diamonds.

http://journal.pricescope.com/Articles/60/1/Performance-and-the-p3-facets%2c-a-discussion-about-step-cut-diamonds.aspx

I want to thank him for his contribution to the Pricescope community.

Andrey
PS Admin

Skippy

"The only things that stand between a person and what they want in life are the will to try it, and the faith to believe it's possible" Rich Devos

........... Karl has joined the diamond trade and is now posting as Karl_K

Ira (Ruffles have Ridges) Z.
____________

If you're looking for diamond shopping tips...this (along with this update) might do the trick!

however...caution: known to have been regarded as armed and dangerous…

There's never a crowd when you go that extra mile.

Rich, Independent GG Appraiser
Sarasota Gemological Laboratory

Garry Holloway FGAA DipDT

HCA and Ideal-scope developer

http://www.ideal-scope.com and
http://www.HollowayDiamonds.com.au

"Style is knowing who you are, what you want to say and not giving a damn." -Gore Vidal

**********************
>Y<

Yoram F.

Antique Diamond Gem
http://www.diagem.net/

"When it doesn't exist, design it..." Sir Henry Royce

~Marian


______________________________________
"It don't mean a thing if it ain't got that bling..."

........... Karl has joined the diamond trade and is now posting as Karl_K

Date: 8/10/2008 11:33:05 AM
Author: sonomacounty
Storm - you are Amazing (and very cute,too). A true diamond genius.


Again, someone in this industry should scoop you up and . . .


Or, maybe someday we'll see Storm Designs, Inc.?


Fantastic, fantastic article. Keep it going. Yay Storm.

........... Karl has joined the diamond trade and is now posting as Karl_K

........... Karl has joined the diamond trade and is now posting as Karl_K

........... Karl has joined the diamond trade and is now posting as Karl_K

RE" In the market, it is common to use the term 'Asscher' to refer to any cut cornered square step cut diamond regardless of origin or even geometry and to use the term 'Royal Asscher' to refer to the products of the House of Asscher.  " 

One should note that an original "Asscher cut" was a early emerald cut (with typically small table), high crown, wide corners and deep paviliion, but the TRADE, seeking to capitalize on the growing popularity of the old cutting style, and because it was never trademarked or patented, started BASTARDIZING the Asscher name, and the cut parameters (much like the current H&A controversy), such that the Royal Asscher company had to patent (D453007) the "Royal Asscher", a squarish wide cornered emerald cut with five rows of pavilion facets, UNLIKE what everyone else tries to pass off now as an "asscher cut" (Note the correct use of a small "a" in asscher, which is the terminology that should be used, since few stones I've seen called "Asschers" bare any relationship to a true Asscher cut, and is an incorrect and possibly illegal play on the company's name).


Rather than being really nit picking, I'll compliment you on your effort, but start with the  Critical Angle and your statement:
 
"In simple terms if the facet angle is below the critical angle it acts like a window and does not return light.", the statement is NEVER true as it depends on the angle of incidence of the light, and there is ALWAYS some light return.

While I admire your attempt, I suggest that if you are going to quote optics references for the subject a better reference on Wiki for you to read and understand is  http://en.wikipedia.org/wiki/Fresnel_equations 

It is a lot of work to try to understand what is really going on, and I admire that you are trying.

Marty Haske GG(GIA), Senior Member NAJA, ISA Appraisal Trained(past ISA), BS(MIT)/MS(MIT)
Adamas Gemological Laboratory

........... Karl has joined the diamond trade and is now posting as Karl_K

Marty Haske GG(GIA), Senior Member NAJA, ISA Appraisal Trained(past ISA), BS(MIT)/MS(MIT)
Adamas Gemological Laboratory

**********************
>Y<

Yoram F.

Antique Diamond Gem
http://www.diagem.net/

"When it doesn't exist, design it..." Sir Henry Royce

Marty Haske GG(GIA), Senior Member NAJA, ISA Appraisal Trained(past ISA), BS(MIT)/MS(MIT)
Adamas Gemological Laboratory

**********************
>Y<

Yoram F.

Antique Diamond Gem
http://www.diagem.net/

"When it doesn't exist, design it..." Sir Henry Royce

Date: 8/15/2008 6:14:24 PM
Author: DiaGem

Date: 8/15/2008 6:05:23 PM
Author: adamasgem

Date: 8/15/2008 5:51:08 PM
Author: DiaGem
Marty..., didn't the Asscher family only recently trademarked 'Royal Asscher'???
Because their Historical patent on cut has long expired? No?

I know about the recent patent with 5 pavilion steps, but I don't know about a trademark filing, perhaps they did on 'Royal Asscher'.

They should have trademarked the name Asscher a long time ago, but I guess didn't, because of what some now call 'asschers' today.

I don't know whether they ever had a design patent per-se on their interpretation of the emerald cut, like they have now.

I remember back in 1998..., I started cutting Asschers but made sure I identify them (myself) as SE's..., (I was not responsible for further down the chain...)
Back then no-one was cutting them yet..., and as soon as people started cutting them in early 2000..., at the beginning people were cautious what they were naming them..., but slowly the name Asscher started appearing everywhere and no (legal)resistant showed up..., thats why Asscher decided to trademark Royal Asscher..., but unfortunately for them the made a wrong business decision and partnered up with the wrong Company for exclusive production and marketing...

They could have made a wiser decision!

Marty Haske GG(GIA), Senior Member NAJA, ISA Appraisal Trained(past ISA), BS(MIT)/MS(MIT)
Adamas Gemological Laboratory

Date: 8/15/2008 6:55:36 PM
Author: adamasgem

Date: 8/15/2008 6:14:24 PM
Author: DiaGem

Date: 8/15/2008 6:05:23 PM
Author: adamasgem

Date: 8/15/2008 5:51:08 PM
Author: DiaGem
Marty..., didn't the Asscher family only recently trademarked 'Royal Asscher'???
Because their Historical patent on cut has long expired? No?

I know about the recent patent with 5 pavilion steps, but I don't know about a trademark filing, perhaps they did on 'Royal Asscher'.

They should have trademarked the name Asscher a long time ago, but I guess didn't, because of what some now call 'asschers' today.

I don't know whether they ever had a design patent per-se on their interpretation of the emerald cut, like they have now.

I remember back in 1998..., I started cutting Asschers but made sure I identify them (myself) as SE's..., (I was not responsible for further down the chain...)
Back then no-one was cutting them yet..., and as soon as people started cutting them in early 2000..., at the beginning people were cautious what they were naming them..., but slowly the name Asscher started appearing everywhere and no (legal)resistant showed up..., thats why Asscher decided to trademark Royal Asscher..., but unfortunately for them the made a wrong business decision and partnered up with the wrong Company for exclusive production and marketing...

They could have made a wiser decision!

I guess in hindsight, Fabricant was the wrong decision.

What do you mean by the term 'SE's'.. and of course, you couldn't possibly know what or how the knockoffs were going to be marketed... otherwise shame on you... SE = Square Emerald[s].

The rest of the sentence =



As to Asscher suing everyone who used their name, it would be an interesting suit, as there are a lot of deep pockets out there who capitalized on it. I'd cetainly, after looking into it, probably, at first glance, side with Asscher for the fradulant sale of 'asschers', much like I'd support a suit against those who misrepresent the classic definitions of H&amp;A's, that which we have accepted for so long, that now wants to be changed.
.

**********************
>Y<

Yoram F.

Antique Diamond Gem
http://www.diagem.net/

"When it doesn't exist, design it..." Sir Henry Royce

Date: 8/15/2008 7:46:04 PM
Author: DiaGem

Date: 8/15/2008 6:55:36 PM
Author: adamasgem

I guess in hindsight, Fabricant was the wrong decision.

What do you mean by the term 'SE's'.. and of course, you couldn't possibly know what or how the knockoffs were going to be marketed... otherwise shame on you... SE = Square Emerald[s].

The rest of the sentence =



As to Asscher suing everyone who used their name, it would be an interesting suit, as there are a lot of deep pockets out there who capitalized on it. I'd cetainly, after looking into it, probably, at first glance, side with Asscher for the fradulant sale of 'asschers', much like I'd support a suit against those who misrepresent the classic definitions of H&amp;amp;A's, that which we have accepted for so long, that now wants to be changed.
.

Marty Haske GG(GIA), Senior Member NAJA, ISA Appraisal Trained(past ISA), BS(MIT)/MS(MIT)
Adamas Gemological Laboratory

Date: 8/15/2008 8:00:46 PM
Author: adamasgem

Date: 8/15/2008 7:46:04 PM
Author: DiaGem

Date: 8/15/2008 6:55:36 PM
Author: adamasgem

I guess in hindsight, Fabricant was the wrong decision.

What do you mean by the term 'SE's'.. and of course, you couldn't possibly know what or how the knockoffs were going to be marketed... otherwise shame on you... SE = Square Emerald[s].

The rest of the sentence =



As to Asscher suing everyone who used their name, it would be an interesting suit, as there are a lot of deep pockets out there who capitalized on it. I'd cetainly, after looking into it, probably, at first glance, side with Asscher for the fradulant sale of 'asschers', much like I'd support a suit against those who misrepresent the classic definitions of H&amp;amp;amp;A's, that which we have accepted for so long, that now wants to be changed.
.

The rest of the sentance was meant to tweek..

**********************
>Y<

Yoram F.

Antique Diamond Gem
http://www.diagem.net/

"When it doesn't exist, design it..." Sir Henry Royce