Parameters for Ovals

[autumngems]

What are the parameters for ovals to avoid a bowtie?

 

[Rockdiamond]

When we’re looking at oval brilliant diamonds there’s a difference in width on the pavilion facets between the center and the tips. This means the flashes in the middle are larger than those at the tips.
Oval Modified Brilliant will avoid this by adding facets below the girdle. Generally this is a better design for fancy colored diamonds.
There are very bad cases where the center of an oval is very dark. In the best cases the center will stay bright.
But I do think there’s a mind clean aspect to it.
Once a person is looking for a bowtie….. they’ll probably see it

 

[tyty333]

There are no easy parameters to avoid a bow-tie. There are some "patented" ovals that avoid bow-ties. Distinctive Gems and BGD
have them but there are not many vendors out there that do have "Ideal" ovals.

 

[Rockdiamond]

Everything at a cost......IMO, taking steps to "reduce bowtie" leads to other deficits...such as spread.
AND_ the dreaded "mind clean" comes into play when a consumer is initially concerned about "bow ties"

 

[tyty333]

Agree David...most people arent willing to go with a super Ideal (8 H&A) due to the reduced LxW and the extra $. Its all a trade-off
which makes it really hard to advise people on ovals. They just dont understand all the ramifications of their specific wants
(not referring to autumgems...just talking in general when people get very detailed in their specs for an oval). The more they narrow
down the specs, the less likely they are to find a nicely cut oval with good light return IMO.

 

[Garry H (Cut Nut)]

Everything at a cost......IMO, taking steps to "reduce bowtie" leads to other deficits...such as spread.
AND_ the dreaded "mind clean" comes into play when a consumer is initially concerned about "bow ties"

Actually, no.
There are some very shallow combinations that perform OK, but hard to find.
The stones with round diamond crown and pavilion angle combinations largely have bow ties. Type 1 bowties - dark right through the middle edge to edge.
Then there are slightly deeper good stones.
Then you get the equivalent of a round diamond nail head with 44 plus degree pavilions and the have Type 2 mail heads confined to the tabel area and are usually very small spread.

 

[Rockdiamond]

Actually, no.
There are some very shallow combinations that perform OK, but hard to find.

Totally!!! I’ve seen some amazing ovals that are kinda shallow. Very hard to find- true.
I was referring to some branded designs that purport to eliminate bow ties that do happen to be kinda deep

 

[Garry H (Cut Nut)]

Totally!!! I’ve seen some amazing ovals that are kinda shallow. Very hard to find- true.
I was referring to some branded designs that purport to eliminate bow ties that do happen to be kinda deep

Round brilliant variations?
Or Moon cuts with a row of super steep lower girdle facets David?

 

[autumngems]

I had an oval many years back and sold it, it was a lovely stone, I should have kept it, now I want another.

 

[tyty333]

Do you remember the cut @autumngems ? 4, 6, or 8 main? If you give your parameters some of us could help you
look.

 

[Rockdiamond]

Round brilliant variations?

To the best of my recollection, they were Oval Modified Designs- unusual for colorless, but they do exist.

 

[Garry H (Cut Nut)]

To the best of my recollection, they were Oval Modified Designs- unusual for colorless, but they do exist.

As someone else said in the GIA new article thread - just buy a round if you want round look!

 

[Rockdiamond]

I wish I had a better side view- but I believe this stone had the steep lower Girdle facets you referred to in the post above....
66.8 depth, 55% table

 

[Garry H (Cut Nut)]

I wish I had a better side view- but I believe this stone had the steep lower Girdle facets you referred to in the post above....
66.8 depth, 55% table

That's the same but different David
The one I showed has crescent shapes facets on the sides only which can allow for shallower pavilions to stop bow ties as well as gain weight.
Yours also gains a lot of hidden weight

 

[autumngems]

Do you remember the cut @autumngems ? 4, 6, or 8 main? If you give your parameters some of us could help you
look.

I don't, that was back when I first got into diamonds and jewelry so I didn't know anything about mains. I was just wondering if there were certain parameters that would eliminate bowtie yet still be an excellent or ideal cut

 

[autumngems]

BG and Elique ovals are lovely but they seem smaller in mm for ctwt than other ovals.

 

[Rockdiamond]

That's the same but different David
The one I showed has crescent shapes facets on the sides only which can allow for shallower pavilions to stop bow ties as well as gain weight.
Yours also gains a lot of hidden weight

I can't argue with that Garry. However I will say that based on so many stones over the years, the people that cut that stone were really geniuses. Long gone from the biz ar this point though.
You have to wonder what will happen to artistry in cutting now that computers have taken over......

 

[tyty333]

BG and Elique ovals are lovely but they seem smaller in mm for ctwt than other ovals.

Yes, that is one of the trade-offs to get decent light return...has to be deeper so you lose some LxW. Most people arent
willing to lose the LxW (plus pay the extra cost for these stones).