What makes this diamond so fiery?

[Cerulean]

Is this diamond particularly fiery or is just this video?

What am I looking at? It seems especially fiery compared to other OECs and I’m mesmerized by it!

1.54 Carat Old European Cut Natural Mined Diamond L Color SI2 Clarity With GIA Certificate

Shape:Old European Cut, Carat Weight:1.54, Color Grade:L, Fancy Color:N/A, Fancy Color Intensity:N/A, Fancy Color Overtone:N/A, Clarity Grade:SI2, Length:7.78 , Width:7.58 , Depth:4.34 , Cut Grade:N/A, Polish:Good, Symmetry:Good, Fluorescence:None, Stone Ratio:1.03, Table %:47, Depth %:56.5...

47jewelry.com

 

[Karl_K]

led lighting
It sure makes it look pretty.

 

[Garry H (Cut Nut)]

As Karl mentioned - LEDs .
Also, strangely, the polish lines add to the fire effect.

 

[Dreamer_D]

I can’t access the images. Can you post the cert and more photos? I see hints of what I think are really nice proportions for an old cut… so it’s maybe not just lighting lol

 

[Lookinagain]

Here's the cert.
There is only the video and one photo that I see.

 

[Texas Leaguer]

Small table, built-up crown, chunky facets, good distribution of contrast. The character of early diamond cuts that many people find so charming.

Of course lighting is critical. A diamond with good fire potential will only realize that potential in the right lighting environment. Like a rainbow after a rainstorm. Not all rainstorms will produce a rainbow - the lighting has to be conducive to seeing it.

 

[LightBright]

I can’t access the images. Can you post the cert and more photos? I see hints of what I think are really nice proportions for an old cut… so it’s maybe not just lighting lol

Maybe it’s a Canada restriction. This diamond is incredible. I love it so much!

I love the slightly worn facet junctions that Garry calls polish lines.

Garry or anyone, please do tell us why some antique cuts have facet junctions that are not perfectly crisp, and therefore are visible. I love this effect! Can modern cutters replicate it?

 

[Texas Leaguer]

Maybe it’s a Canada restriction. This diamond is incredible. I love it so much!

I love the slightly worn facet junctions that Garry calls polish lines.

Garry or anyone, please do tell us why some antique cuts have facet junctions that are not perfectly crisp, and therefore are visible. I love this effect! Can modern cutters replicate it?

I think the slightly abraded facet junctions are a different feature than the polish lines Garry was mentioning. Those are the parallel lines you see running across some facets. This is also related to the grade of "good" for polish on the GIA report, which is of course two grades below mirror finish.

This could be due to the less precise cutting tools used to craft this stone. Which also could be part of the reason that the facet junctions are not crisp. Abraded facet junctions can also happen from wear and especially if the diamond shared a space with other diamond jewelry. It's always best to seperate your diamond jewelry in your jewelry box.

 

[Texas Leaguer]

I think Garry's comment about the possibility of the polishing lines contributing to the fire is related to diffraction grating.

Diffraction grating - Wikipedia

en.wikipedia.org

 

[Dreamer_D]

Maybe it’s a Canada restriction. This diamond is incredible. I love it so much!

I love the slightly worn facet junctions that Garry calls polish lines.

Garry or anyone, please do tell us why some antique cuts have facet junctions that are not perfectly crisp, and therefore are visible. I love this effect! Can modern cutters replicate it?

Yeah it’s definitely a Canada thing. I can never open links for that website though I can access the website and search it.

 

[canuk-gal]

Ditto: Was just gonna post the same thin

Yeah it’s definitely a Canada thing. I can never open links for that website though I can access the website and search it.

Ditto. Was gonna post the same thing!

 

[LightBright]

I think the slightly abraded facet junctions are a different feature than the polish lines Garry was mentioning. Those are the parallel lines you see running across some facets. This is also related to the grade of "good" for polish on the GIA report, which is of course two grades below mirror finish.

This could be due to the less precise cutting tools used to craft this stone. Which also could be part of the reason that the facet junctions are not crisp. Abraded facet junctions can also happen from wear and especially if the diamond shared a space with other diamond jewelry. It's always best to seperate your diamond jewelry in your jewelry box.

Thank you! I didn’t know what Garry meant, but I should have. Polish lines are an artifact from polishing the flat surfaces I’m guessing. I thought that might also be called surface graining, but maybe that term refers to the diamond’s inherent grain that can’t be polished out? I’ll read the article you posted to find out.

I’ve heard the concept you mention, that worn facet junctions are from jewelry being stored together but the thing about worn facet junctions on antique stones is that they are 1) usually uniformly all over the stone, even in places that would be protected by a basket (pavilion and culet) and usually found on older cut stones. It’s rare to see them on OECs like this, more common to see them on older larger culet stones and older cuts like Old Mine Cushions.

I think your first statement could be getting to the heart of the matter (that the rougher facet junctions are from cutting tools. OR, that the diamonds rolled around together loose. But I’d think that would have affected the polish like there would be dings/wear on the flat surfaces.

It’s a burning question I’ve always wondered about in old diamonds.

 

[Texas Leaguer]

Thank you! I didn’t know what Garry meant, but I should have. Polish lines are an artifact from polishing the flat surfaces I’m guessing. I thought that might also be called surface graining, but maybe that term refers to the diamond’s inherent grain that can’t be polished out? I’ll read the article you posted to find out.

I’ve heard the concept you mention, that worn facet junctions are from jewelry being stored together but the thing about worn facet junctions on antique stones is that they are 1) usually uniformly all over the stone, even in places that would be protected by a basket (pavilion and culet) and usually found on older cut stones. It’s rare to see them on OECs like this, more common to see them on older larger culet stones and older cuts like Old Mine Cushions.

I think your first statement could be getting to the heart of the matter (that the rougher facet junctions are from cutting tools. OR, that the diamonds rolled around together loose. But I’d think that would have affected the polish like there would be dings/wear on the flat surfaces.

It’s a burning question I’ve always wondered about in old diamonds.

Your point about uniformity is astute. You would have to study all the facet junctions to determine if only those exposed to wear are abraded. In which case it's not the tools or craftsmanship but rather wear and tear.

The flat surfaces of the facets are (much) less susceptible to damage than the edges at the facet junctions. Just like the points (e.g the four corners of a princess cut) are more susceptible to damage that the flat sides.

 

[Cerulean]

As Karl mentioned - LEDs .
Also, strangely, the polish lines add to the fire effect.

Yes the polish lines! I’ve looked at dozens of other videos with the same LED lighting / same set up on this website and none of them look like this! I felt like my eyes were seeing something else I couldn’t put my fingers on

 

[LightBright]

Yes the polish lines! I’ve looked at dozens of other videos with the same LED lighting / same set up on this website and none of them look like this! I felt like my eyes were seeing something else I couldn’t put my fingers on

The article posted by Texas Leaguer above describes this phenomenon, technically.