New Mineral Named After GIA’s John Koivula
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 Post subject: Appraising a cut corner triangle diamond
PostPosted: Thu Aug 08, 2019 8:30 am 
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Joined: Mon Aug 05, 2013 8:26 am
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Location: Rhode Island
Hello

I am looking for some help in appraising a cut corner triangle diamond. sometimes known as a calf head diamond. Does anyone have a weight estimation formula and / or access to a price guide for this cut?

Thanks so much in advance,
Melicia


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 Post subject: Re: Appraising a cut corner triangle diamond
PostPosted: Thu Aug 08, 2019 6:34 pm 
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Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19853
Location: San Francisco
Hi Melicia
Gemstone Weight Estimation by Charles Carmona is a great reference for an appraiser to have on their shelf:
Calf's Head
Width x Height x Depth x Specific Gravity (3.52) x (0.00270-0.00290)
Width=side to side points
Height=top to bottom
Image
Leon Mege carries them:
https://www.leonmege.com/side-stones

Ava Diamond Corp:
https://avadiamonds.net/side-stones/sid ... ond-pairs/


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 Post subject: Re: Appraising a cut corner triangle diamond
PostPosted: Thu Aug 08, 2019 7:02 pm 
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Interesting. As far as I know,the only thing close to a formal taxonomy for gem shapes is the Long and Steele classification. In that, this would be type 16, cut-corner triangle, not type 26, calf's head, which is entirely different.

If this was cut from a GemCad compatible design, you can establish the volume more accurately from the V/W3 ratio.


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 Post subject: Re: Appraising a cut corner triangle diamond
PostPosted: Fri Aug 09, 2019 6:55 am 
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Joined: Mon Aug 05, 2013 8:26 am
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Thank you!


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