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Alexandrite?

AndrewAWoody

Rough_Rock
Joined
Apr 6, 2020
Messages
12
I purchased a "peridot" ring today but I think it is alexandrite or chrysoberyl. It glows very brightly under UV light and can change from near clear to a vibrant lime green depending on lighting. If you know what this is please tell me, thanks. DSCN1017.JPG DSCN1016.JPG I tried to get the green I got earlier but we have overcast now so it isn't as vibrant as earlier. DSCN1015.JPG
 

Bron357

Ideal_Rock
Premium
Joined
Jan 22, 2014
Messages
4,122
Hi, it is synthetic Spinel. I have a similar ring. The colour is very pretty, being Spinel it’s also a hard wearing gem as well so suitable for everyday wear.
Colour change gems are identified by their colour change in daylight light compared to the colour they turn under incandescent light ie candle light.
Alexandrite is typically a teal green colour in daylight and under incandescent light turns to a purple red colour. Under UV light it glows an orangish colour.
There are other gems like garnet, sapphire and fluorite that change colour under different light sources.
UV light only detects fluorescence not colour change. For example white diamonds can glow blue under UV light. Synthetic blue sapphire can glow red under UV light.
 

AndrewAWoody

Rough_Rock
Joined
Apr 6, 2020
Messages
12
Hi, it is synthetic Spinel. I have a similar ring. The colour is very pretty, being Spinel it’s also a hard wearing gem as well so suitable for everyday wear.
Colour change gems are identified by their colour change in daylight light compared to the colour they turn under incandescent light ie candle light.
Alexandrite is typically a teal green colour in daylight and under incandescent light turns to a purple red colour. Under UV light it glows an orangish colour.
There are other gems like garnet, sapphire and fluorite that change colour under different light sources.
UV light only detects fluorescence not colour change. For example white diamonds can glow blue under UV light. Synthetic blue sapphire can glow red under UV light.
Thank you very much, I appreciate the help greatly.
 

pokerface

Shiny_Rock
Joined
Sep 12, 2011
Messages
208
Actually, I feel pretty confident that it's uranium vaseline glass. A quick google search yields dozens of nearly identical results, and uranium causes the bright green UV glow.
 

AndrewAWoody

Rough_Rock
Joined
Apr 6, 2020
Messages
12
Actually, I feel pretty confident that it's uranium vaseline glass. A quick google search yields dozens of nearly identical results, and uranium causes the bright green UV glow.
Thank you very much. It looks like I need to buy a second UV light that does the high wave lengths to solve this mystery. I have a sterling ring with what I assumed to be uranium glass that I now wonder about too. I am also noticing that the uranium/spinel rings on ebay put both in title. As to value it probably doesn't matter much but I would like to know :)
 

pokerface

Shiny_Rock
Joined
Sep 12, 2011
Messages
208
Seems like synthetic spinel/uranium vaseline glass are the same thing. I would not buy anything to test the stone because it’s not particularly valuable. I assume the setting is 10k gold or gold plate at best; I would consider it to be costume jewelry. IMO a price of $200+ is significantly inflated.
 

AndrewAWoody

Rough_Rock
Joined
Apr 6, 2020
Messages
12
Seems like synthetic spinel/uranium vaseline glass are the same thing. I would not buy anything to test the stone because it’s not particularly valuable. I assume the setting is 10k gold or gold plate at best; I would consider it to be costume jewelry. IMO a price of $200+ is significantly inflated.
It was 10k and I paid scrap plus tax so I didn't pay for the stone anymore than I do any ring. I think I'll buy the light, not much, because natural spinel can "glow" under black light high band from what I read and can be worth a fair amount. In any case I like the ring and I appreciate your help, thank you again.
 

AndrewAWoody

Rough_Rock
Joined
Apr 6, 2020
Messages
12
I promise you it is not a natural spinel. Natural spinel simply does not come in that shade of green. Your ring is nearly identical to this: https://forums.vintagefashionguild.org/threads/vintage-uranium-vaseline-glass-ring.64608/
I believe you. Plan on getting high range uv light to see what fake looks like as opposed to real. I'm looking at some GIA certified pieces on Ebay so I can study it and learn to spot it. Might be able to make decent money with a black light at pawn shops :)
 

AndrewAWoody

Rough_Rock
Joined
Apr 6, 2020
Messages
12
I promise you it is not a natural spinel. Natural spinel simply does not come in that shade of green. Your ring is nearly identical to this: https://forums.vintagefashionguild.org/threads/vintage-uranium-vaseline-glass-ring.64608/
I'm studying up on Spinel. Most pawn shops don't know gems and a quality spinel can get some decent money. My man made one has no magnetic qualities which apparently real ones do. I'm taking my black light and magnet out to treasure hunt this week ;-) Once I get good at finding the real stuff I might pick another gem to learn about.
 

Gloria27

Shiny_Rock
Premium
Joined
Jul 21, 2015
Messages
369
Not all spinels are magnetic, depends on the iron content. You're more likely to pick up garnets (when loose) with a magnet than anything else because they get dragged (although not all Garnets).
Magnetism can also be really faint sometimes and hard to detect.
Iron can make stones look brown thus less valuable, so magnetism isn't really telling you anything about the value of the stone. If I had to chose between two red gems using a magnet, I'd chose the one that doesn't drag, might be a ruby and not a dirt cheap garnet.

It literally takes years of seeing thousands of stones/ pictures of stones, to really create your own mental library on how real stones look like, but you are in the right place, so enjoy!
 
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