Time to catch up on reading, lapidary projects and binge watching TV. Stay home. Stay well.
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Tue Apr 07, 2020 4:34 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 11 posts ] 
Author Message
 Post subject: Emerald recut
PostPosted: Sun Feb 16, 2020 1:09 pm 
Offline
Valued Contributor

Joined: Sun Feb 18, 2007 11:24 pm
Posts: 150
Hello, i was wondering what you guys think of recutting this emerald, is it a risk worth taking? It is 3.77 cts, i wonder how much i will lose, any ideas? Thx


Attachments:
Screenshot_20200216-090626_Messenger.jpg
Screenshot_20200216-090626_Messenger.jpg [ 786.09 KiB | Viewed 300 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Feb 16, 2020 1:13 pm 
Offline
Gemology Online Veteran

Joined: Thu May 12, 2016 2:18 am
Posts: 736
I assume you are wanting to get rid of the large window in the stone.

Measure the length X Width X Depth and post them so we can calculate what size a stone without a window would be.


Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Apr 05, 2020 5:06 pm 
Offline
Valued Contributor

Joined: Sun Feb 18, 2007 11:24 pm
Posts: 150
Hi, sorry for the late reply, it measures 10.56 by 8.79 by 5.45mm.

Is that enough info? Thx


Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Apr 05, 2020 7:30 pm 
Offline
Gemology Online Veteran

Joined: Thu May 12, 2016 2:18 am
Posts: 736
Well it has a 62% depth to width ratio. This should be enough to remove the window depending on how much of the total depth is above and bellow the girdle line. If proportions are right I would be inclined not to recut the top, just do the pavilion. And also just do the center width, while leaving the bulge in at the ends.

Please post a view from the side both length and width so we can see in cross section how the pavillion bulge looks.

If all is right, you should be able to keep the stone well above 3 carats with no window.


Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Apr 05, 2020 9:04 pm 
Offline
Valued Contributor

Joined: Sun Feb 18, 2007 11:24 pm
Posts: 150
Hello here is the side view,

Thanks so much for the reply.

I should get this recut but the seller mentioned this was the best cut for the stone, i cant understand why but now i think that the center as is, darkens into a window, but the center if cut has a bit if yellowish green, very light color to it, im guessing instead of cutting it nicely, to hide the light hue in the center, the cutter left it as a window and darkens when set.... just my thoughts. Is it a risk to recut, could it lighten the stone? Im sure its impossible to know unless i do cut it, just a thought anyways. Thx


Attachments:
Screenshot_20200405-175605_Video Player.jpg
Screenshot_20200405-175605_Video Player.jpg [ 412.51 KiB | Viewed 99 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Apr 05, 2020 9:29 pm 
Offline
Gemology Online Veteran

Joined: Thu May 12, 2016 2:18 am
Posts: 736
Tweezers blocking the part we need to see.

It cut was that way to save weight, no other reason. Color will improve when properly cut. The light will travel a further distance reflecting in the stone and so absorb more color. Transmitted light in the window area only travels once through the stone.


Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Apr 05, 2020 9:32 pm 
Offline
Valued Contributor

Joined: Sun Feb 18, 2007 11:24 pm
Posts: 150
Oh right, cheers, uploaded better pics.


Attachments:
20200405_183008.jpg
20200405_183008.jpg [ 4.96 MiB | Viewed 94 times ]
20200405_183034.jpg
20200405_183034.jpg [ 4.8 MiB | Viewed 94 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Apr 05, 2020 10:47 pm 
Offline
Gold Member

Joined: Thu Apr 17, 2008 1:47 am
Posts: 1325
Location: Pacific Northwest
Be sure to observe it in immersion fluid before you make a decision to cut. Some emeralds have a green rind over a colorless core.

_________________
I just dreamed that I was a butterfly.


Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Apr 05, 2020 11:09 pm 
Offline
Valued Contributor

Joined: Sun Feb 18, 2007 11:24 pm
Posts: 150
a green rind?

ok, will do the immersion test, not exactly sure what I am looking for here tho. I can take pics

thanks


Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Sun Apr 05, 2020 11:53 pm 
Offline
Gemology Online Veteran

Joined: Thu May 12, 2016 2:18 am
Posts: 736
As you can see the row of facets closest to the girdle is very steep. Probably around 70 degrees. This made it so that the cutter had to cut below 39.5 degrees on the last one or two rows in order to close the culet. This is why you have a window, and all the color seems to be around the edges of the stone.

All that needs to be done to close the window is cut the first row of facets closer to 50 degrees so by the third row where you close the girdle you are still above 39.5 degrees.

You will want to have your cutter examine the stone for other complications such as cracks, inclusions, and color zones before recutting. You will also have to re-oil the stone after cutting.

It looks like a good candidate if you don't mind the weight loss. You will not lose any perception of size because the diameter should remain the same.

Keep in mind, I am not recommending that you actually do the recut, only trying to inform you on what is possible if you do.


Top
 Profile  
Reply with quote  
 Post subject: Re: Emerald recut
PostPosted: Mon Apr 06, 2020 10:44 pm 
Offline
Valued Contributor

Joined: Sun Feb 18, 2007 11:24 pm
Posts: 150
Great, Thanks so much for the info!

That makes sense, too bad the cutter didnt have the common sense to do that in the first place. yud think they would know what they are doing since nearly all emerald is specifically cut in India as they are supposedly the best emerald cutters there. It doesnt make sense to me really. Thanks again! cheers. Ill start looking into the details regards color zoning and cracks,


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock