The central crystal is really unusual at first I thought it was a number of chips but after looking closely there are a number of cushion cut crystals on one stone. It also has veins etched in between the cut crystals or is this natural? Is it aquamarine, the metal is 800 silver. I think it’s really different as I’ve never seen this effect in jewellery before.
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Post subject: Re: What type of crystal is this stone?
Posted: Fri Sep 11, 2020 3:07 pm
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Have checked the crystal under an ultra violet light and it glows red across all of it. If it was glue it would show a different colour surely. After doing some research this could be fluorite. The small stones around the centre stone show black in ultra violet light.
Post subject: Re: What type of crystal is this stone?
Posted: Sat Sep 12, 2020 4:54 am
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Here’s some pics of the brooch, a couple of the back and one of the stone under uv light. It is a bit dark but you can see how the crystal is showing red. Hope this helps.
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Post subject: Re: What type of crystal is this stone?
Posted: Sat Sep 12, 2020 11:57 am
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Joined: Fri Jun 25, 2010 12:04 am Posts: 257 Location: Idaho
Look closely at the photos - in the center there are 5 light blue faceted objects joined by a colorless resinous substance.
In the UV photo, the faceted items are glowing reddish, the colorless stuff is just reflecting the red a bit.
None of the center stuff is of the same style or age as the rest of the piece. Probably something in the center fell out, and there was a clumsy attempt to fill it in.
What low-priced natural or imitation/synthetic gem fluoresces red? I am at work and need to get setting gems so I don't have time to look it up.
5 of those are attached to the piece with an excess of adhesive.
OK - so I looked. Don't tell my Boss!
Most likely flame fusion spinel...
?
Back to setting diamonds!
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Post subject: Re: What type of crystal is this stone?
Posted: Sat Sep 12, 2020 1:01 pm
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Excellent help!!! Thanks.
The piece is stamped 800, most probably indicating silver 80%, alloy 20%. The piece is very tarnished or perhaps it was plated in the beginning of its life.
Aside from that abeck is correct. There are 5 stones in the center which have been glued together and the glue (under UV) is reflecting their fluorescence.
I suspect the accent stones are foil backed glass but that is speculation. Check them with magnification, SueWillBow.
Post subject: Re: What type of crystal is this stone?
Posted: Sat Sep 12, 2020 1:15 pm
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Joined: Fri Jun 25, 2010 12:04 am Posts: 257 Location: Idaho
Barbra Voltaire, FGG wrote:
Excellent help!!! Thanks.
I suspect the accent stones are foil backed glass but that is speculation. Check them with magnification, SueWillBow.
I was wondering about that too. They could be either foil backs that have lost their foil (don't see proper reflection for the mirroring), or either non-foil back glass or the original "rhinestone", faceted quartz.
_________________ Lapidarist by Passion Goldsmith by Necessity
Facetron x2 Polymetrics OMF GemCad/GemRay/Gem Cut Studio Matrix 9/Rhino 5, 6, 7 REVO A (still hanging on...) B9 Creator Core 5 Series XL Indutherm MC-15
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