New Mineral Named After GIA’s John Koivula
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 Post subject: Ethiopian crystal opal - Crack filling with UV adhesive
PostPosted: Wed Aug 30, 2017 2:01 am 
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Fracture filled crystal opal from Ethiopia

The picture shows different views of an Ethiopian crystal opal before (left) and after (right) treatment with ordinary UV adhesive:

Image

The result is by far not perfect, the cracks are still visible (although to a lesser extent).

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 Post subject: Re: Ethiopian crystal opal - Crack filling with UV adhesive
PostPosted: Wed Sep 06, 2017 9:46 am 
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Isn't the treatment more expensive than the stone at some point ? :)


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 Post subject: Re: Ethiopian crystal opal - Crack filling with UV adhesive
PostPosted: Thu Sep 07, 2017 1:57 am 
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No, it's a 25ct contra-luz opal with a "phantom" (the stone will be recut)
Consumption of adhesive is low, time and effort for the treatment are negligible.
Furthermore, it was more important to find out, which viscosity, RI and curing time is neccessary.
So, the knowledge gain is priceless.

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 Post subject: Re: Ethiopian crystal opal - Crack filling with UV adhesive
PostPosted: Thu Sep 07, 2017 12:16 pm 
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goldberg wrote:
So, the knowledge gain is priceless.

With that I agree.
Always.


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 Post subject: Re: Ethiopian crystal opal - Crack filling with UV adhesive
PostPosted: Thu Sep 07, 2017 1:06 pm 
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goldberg wrote:
No, it's a 25ct contra-luz opal with a "phantom" (the stone will be recut)
Consumption of adhesive is low, time and effort for the treatment are negligible.
Furthermore, it was more important to find out, which viscosity, RI and curing time is neccessary.
So, the knowledge gain is priceless.

I'd love to know your findings.


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