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Ethiopian crystal opal - Crack filling with UV adhesive
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=24&t=23927
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Author:  goldberg [ Wed Aug 30, 2017 2:01 am ]
Post subject:  Ethiopian crystal opal - Crack filling with UV adhesive

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).

Author:  Isi [ Wed Sep 06, 2017 9:46 am ]
Post subject:  Re: Ethiopian crystal opal - Crack filling with UV adhesive

Isn't the treatment more expensive than the stone at some point ? :)

Author:  goldberg [ Thu Sep 07, 2017 1:57 am ]
Post subject:  Re: Ethiopian crystal opal - Crack filling with UV adhesive

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.

Author:  Isi [ Thu Sep 07, 2017 12:16 pm ]
Post subject:  Re: Ethiopian crystal opal - Crack filling with UV adhesive

goldberg wrote:
So, the knowledge gain is priceless.

With that I agree.
Always.

Author:  R'Shara [ Thu Sep 07, 2017 1:06 pm ]
Post subject:  Re: Ethiopian crystal opal - Crack filling with UV adhesive

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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