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 Post subject: Why do hydrothermal synthetics look so weird?
PostPosted: Fri Jun 26, 2020 9:13 am 
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Are they a single crystal or a microcrystalline mass? Why do they all have that weird slab shape?


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 Post subject: Re: Why do hydrothermal synthetics look so weird?
PostPosted: Sat Jun 27, 2020 11:19 pm 
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They have crystal structure just like the natural stones. They are not microcrystalline.

The Russian Hydrothermal rough looks like slabs because of the seed crystal growth method. This method leaves a colorless, often near opaque core in the rough. The rough pieces are trimmed usually by cutting them down the middle to remove this unusable core. This is why they look like slabs. If you saw them before being sawn you would see the crystal shape.


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 Post subject: Re: Why do hydrothermal synthetics look so weird?
PostPosted: Sun Jun 28, 2020 2:27 pm 
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Looks like classic Chatham flux fusion to me...


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 Post subject: Re: Why do hydrothermal synthetics look so weird?
PostPosted: Sun Jun 28, 2020 9:06 pm 
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I mean these slabs:
https://m.alibaba.com/product/60771107959/Synthetic-Hydrothermal-Zambian-Uncut-Green-Emerald.html

I didn’t know Chatham uses hydrothermal method for emeralds, I thought they only use flux.

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 Post subject: Re: Why do hydrothermal synthetics look so weird?
PostPosted: Sun Jun 28, 2020 9:19 pm 
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Thank you for correcting that!
I was worried about the confusion ftom yhe experts.


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 Post subject: Re: Why do hydrothermal synthetics look so weird?
PostPosted: Sun Jun 28, 2020 10:57 pm 
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Mandira wrote:
I mean these slabs:
https://m.alibaba.com/product/60771107959/Synthetic-Hydrothermal-Zambian-Uncut-Green-Emerald.html

I didn’t know Chatham uses hydrothermal method for emeralds, I thought they only use flux.


Chatham currently uses what he describes as hydrothermal flux.


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 Post subject: Re: Why do hydrothermal synthetics look so weird?
PostPosted: Sun Jun 28, 2020 11:53 pm 
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Interesting... To my layperson’s ears that sounds like a combination of the two.

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~ Aspiring designer/creator of jewellery with colourful lab & fair trade mined gems ~


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 Post subject: Re: Why do hydrothermal synthetics look so weird?
PostPosted: Mon Jun 29, 2020 9:27 am 
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Mandira wrote:
I mean these slabs:
https://m.alibaba.com/product/60771107959/Synthetic-Hydrothermal-Zambian-Uncut-Green-Emerald.html

I didn’t know Chatham uses hydrothermal method for emeralds, I thought they only use flux.



The synthetic emeralds in your link were produced in exactly the method I previously described.


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