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 Post subject: Re: ??Topaz refractive index??
PostPosted: Fri Sep 17, 2010 6:42 am 
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I forgot to tell everyone this gem is c/ch not what to call it color/change or color/shift indoors its pink outdoors its coppery bronze color and other times it looks orange/pink :?:
Im going to try and get into the lab at work today and look under 100X microscope anything i should see that you can tell me off hand?

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 Post subject: Re: ??Topaz refractive index??
PostPosted: Mon Sep 27, 2010 7:27 pm 
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I have this gem whats beleaved to be pink topaz i just took the refactive index and got 1.76 what could this mean ??


I guess that means someone passed you synthetic corundum for topaz, most probably. Sorry.


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 Post subject: Re: ??Topaz refractive index??
PostPosted: Tue Sep 28, 2010 2:09 am 
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I agree with cascaillou
HUK

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 Post subject: Re: ??Topaz refractive index??
PostPosted: Tue Sep 28, 2010 12:10 pm 
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But im sure the person didnt know becuase iv made four other trades (20ct kunzite) (8ct muzo emerald) (6ct Kyanite) (20x8mm clean baltic amber) and of witch i trade giant megalodon teeth the teeth i find were i live . And all the other gem have checked out so i guess one out of five isnt to bad .I did put the stone under UV and got this http://www.flickr.com/photos/zircons/5026514797

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 Post subject: Re: ??Topaz refractive index??
PostPosted: Tue Sep 28, 2010 2:06 pm 
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sure, the one who sold it to you might be the one that was fooled in he first place.


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 Post subject: Re: ??Topaz refractive index??
PostPosted: Tue Sep 28, 2010 2:51 pm 
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cascaillou wrote:
sure, the one who sold it to you might be the one that was fooled in he first place.


I find that is most often the case.

Often, people aren't trying to intentionally be deceptively fraudulent ( :evil: ), they are just misinformed or have made some erroneous assumptions.


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 Post subject: Re: ??Topaz refractive index??
PostPosted: Tue Sep 28, 2010 7:04 pm 
Osman khattak wrote:
I agree with cascaillou
HUK


Gap between expected and observed RI looks unbridgeable. Optical character and sign? FWIW (not too much, I guess) I'm with Cascaiallou on this one.

UV illumination is not likely to give a reliable indicator. A check of SG may or may not give you another good indicator - but worth trying anyway?


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 Post subject: Re: ??Topaz refractive index??
PostPosted: Tue Sep 28, 2010 7:27 pm 
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All this consideration about this stone... If your RI is correct then it indicates sapphire. The cut is "native" and it appears to have some color zoaning. This indicated a natural sapphire (INDICATES ONLY), having a color shift is also cool. The UV looks like chromium. Perhaps you did better than you think. Without seeing it in person, and having only hearsay results (no offence ment), it is impossible to tell from here.


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 Post subject: Re: ??Topaz refractive index??
PostPosted: Tue Sep 28, 2010 7:30 pm 
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well, more tests would be needed to confirm the nature of the stone, but I think there's high probability of it being synth. corundum.


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 Post subject: Re: ??Topaz refractive index??
PostPosted: Wed Sep 29, 2010 2:25 pm 
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Thanks everbody I thought it might have been some kind of missed ID this person travles around to some very remote place from his home in malaysia collecting gems and fossils so my thinking was wrong ID on the gem thats why i was trying so hard to find out what it could be its the color zoning and the color/shift that really made me think it was some how natural i do have the option to send it to someone with all the tool needed from a real ID I was just trying to do it my self becuase id be very Proud to have done it but its a really stumper Under 20x i see no striae I have one more thing im going to do myself thats look under 100x as soon as i get into the lab at work is there anything i would see to tell me its 100% natural :?:

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 Post subject: Re: ??Topaz refractive index??
PostPosted: Wed Sep 29, 2010 7:58 pm 
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as you have a refractometer, you should first try to confirm that this is indeed corundum (optical character, optical sign and birefringence)


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