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Tom Mazanec
Joined: 11 Feb 2016
Posts: 139
Location: Twinsburg, Ohio
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 Posted: Dec 31, 2020 13:09 Post subject: Cutting diamonds |
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| What determines whether a big diamond is divided up or made into a big jewel? For example, why was the Cullinan cut up into nine big gems (and bipity-bip tiny ones) instead of one or two monsters?
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John Betts
Joined: 07 Jun 2012
Posts: 207
Location: New York City
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| Posted: Dec 31, 2020 13:26 Post subject: Re: Cutting diamonds |
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To maximize the total weight of "clean" gemstones. Search on "Rough Diamond Planning" to understand why two or three gemstones are made from a single diamond.
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John Betts |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Dec 31, 2020 14:51 Post subject: Re: Cutting diamonds |
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Not exactly the same theme but very interesting program on CNBC, Streets of Dreams with Marcus Lemonis, Diamond District in NY, 47th Street. Season 1, Episode 1, 12/29/2020.
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hogwild |
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James Catmur
Site Admin
Joined: 14 Sep 2006
Posts: 1343
Location: Cambridge
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| Posted: Jan 01, 2021 10:05 Post subject: Re: Cutting diamonds |
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I had always thought it was down to the crystal structure of the initial stone and how best to cleave it, getting the best 'light' from the stones cleaved from it, and in the end, maximizing the value of the resulting stones.
But I know nothing about the subject, so that is just my conjecture
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 4895
Location: Barcelona
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| Posted: Jan 01, 2021 15:00 Post subject: Re: Cutting diamonds |
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| Roger Warin wrote: |
Hello,
Historically, the position of the cleavage was a decisive first step.
The problem is difficult to solve when the stone is very expensive. It takes several months of study if not more, the responsibility of the cutter is great.
I advise you to ask your question Eddy Vleeschdrager, an expert from Antwerp.
He has been a friend for several decades. I meet him regularly.
He is as friendly as possible and very helpful.
Roger.
Expert Diamond | CURR.VITAE | Eddy Vleeschdrager Curriculum Vitae (expert-diamond . com)
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Roger Warin
Joined: 23 Jan 2013
Posts: 1176
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| Posted: Jan 01, 2021 17:00 Post subject: Re: Cutting diamonds |
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Hello diamond lovers
Here are some specimens.
| Mineral: | Diamond |
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5120 Time(s) |
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| Mineral: | Diamond |
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5123 Time(s) |
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| Mineral: | Diamond |
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5124 Time(s) |
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| Mineral: | Diamond |
| Locality: | | Mirny Mine, Mirny, Mirninsky District, Sakha Republic (Yakutia), Russia |  |
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| Description: |
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| Viewed: |
5120 Time(s) |
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| Mineral: | Diamond |
| Description: |
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| Viewed: |
5121 Time(s) |
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| Mineral: | Diamond |
| Description: |
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| Viewed: |
5120 Time(s) |
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| Mineral: | Diamond |
| Description: |
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| Viewed: |
5129 Time(s) |
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| Mineral: | Diamond |
| Description: |
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| Viewed: |
5125 Time(s) |
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