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 Post subject: Check out my sapphire wannabe (glass chunk)
PostPosted: Tue Sep 08, 2020 7:54 pm 
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Joined: Wed Sep 02, 2020 11:23 am
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Hello Gemology fans and pros! Newbie here.
The subject is what brought me to this discipline.
I will cut a piece and have it checked somewhere, just for my curiosity.
Then if I'm lucky with time I will acquire some tools and learn faceting on my mystery glass chunk.
Do you think it is facetable?
Or maybe I should keep it as is for sentimental reasons?
Anyways, I have a 3 minutes video for you:

and some photos.


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 Post subject: Re: Check out my sapphire wannabe (glass chunk)
PostPosted: Thu Sep 10, 2020 7:37 pm 
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Joined: Wed Aug 09, 2017 8:33 pm
Posts: 45
I would not bother faceting it as this will surely turn out to be just a black gemstone because of its high absorption to light. Even if you are a beginning into faceting and you have "nothing to loose", when I look back at my first few dark-rough-turned-into-gemstone experiences, I consider that time as wasted time. Not to mention it was a sad disappointment when finally looking at the final product of that hard work, be nothing but an opaque gem.


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 Post subject: Re: Check out my sapphire wannabe (glass chunk)
PostPosted: Sat Sep 12, 2020 3:49 pm 
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Joined: Wed Sep 02, 2020 11:23 am
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TheL wrote:
I would not bother faceting it as this will surely turn out to be just a black gemstone because of its high absorption to light. Even if you are a beginning into faceting and you have "nothing to loose", when I look back at my first few dark-rough-turned-into-gemstone experiences, I consider that time as wasted time. Not to mention it was a sad disappointment when finally looking at the final product of that hard work, be nothing but an opaque gem.


TheL what you say makes a lot of sense.
But right now I'm having a ton of fun with this "gem".
I have cut a sliver like in photo attached.
I polished by hand as few facets I could, using my fingers, sandpaper and then a DVD and toothpaste. I do not own or have access to a faceting machine, yet. Also cerium oxide will take weeks to arrive, same with diamond paste or other goodies.
I am proud of my efforts so far - can you see the GemologyOnline.com homepage on my laptop's screen reflected in a facet (irregular pentagon, max 1/2 inch across)?
This "gem" material has some funny refracting behaviour.
I requested a price offer for an expertise and I am waiting for an answer from a gemology expert.
But just looking at the photo attached, you have the light right from above and the (phone) camera at 45 degrees. The light does get inside and gets out the opposing side. The issue is with the light coming back toward the light source (and to the observer). For some bizarre facet angle setups you DO have light coming back out - see the photo attached. For many others, not.
So maybe some inspired cutting design could eventually bring out brilliance from this dark, light absorbing material.


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 Post subject: Re: Check out my sapphire wannabe (glass chunk)
PostPosted: Mon Sep 14, 2020 9:14 pm 
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Joined: Sun Oct 16, 2005 12:22 pm
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Location: San Francisco
If you would like to send me that bit, I'll test it and identify it for you.
Let me know.


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