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Can anyone identify the gemstone in this old brooch, 2 inches wide? Goes blue green in fluorescent light.

0 votes

asked May 24, 2016 by minette (120 points)

3 Answers

0 votes
I don't know about the blue green it turns in fluorescent light, but it looks like ametrine to me. Some call it trystine. It's a mixture of amethyst and citrine and is purple/orange. Your picture shows mostly purple but the bottom looks a bit orange. I believe it is ametrine.
answered May 29, 2016 by JohnBagel (1,010 points)
Hi John, many thanks for taking the trouble to reply: I've never noticed orange and I think - correct me if I am wrong, that ametrine is bi-coloured rather than colour change in nature. I did have a comment from an auctioneer who saw a photo that perhaps it was a 'synthetic' sapphire, but I am guessing the rather curious setting suggests the brooch is quite old, or maybe from another country (I'm in England). Not sure that synthetic sapphires were around when the brooch was made, although it is likely I am wrong!
I honestly don't know very much about rocks or gems at all. Though I find them all fascinating, I'm still way in the learning stage. I recently bought a tumbled piece of ametrine and when I googled it afterward, I've seen images of it on Google that look like the same size and shape of your piece. I do see orange in the bottom cuts of the piece in your image, but maybe it's a reflection of the brooch. I wouldn't say that it's full amethyst because it is faintly purple. And in some of the images I've seen of ametrine it was faint purple, some didn't have orange in it. Again I'm certainly no expert, just trying to give some help and suggestion. I don't know anything about synthetic materials or synthetic sapphire specifically. But after searching "synthetic sapphire purple" on Google Images, there are a few pieces that have the same shade as yours, so it could very well be synthetic sapphire.
I think the orange is to do with my (not very good) photography. As to identification,  it does seem not many colour change stones go, as mine does, from lavender in day light  to blue/green in fluorescent. Most seem to change the other way round ...
Maybe this site may help? http://www.gemselect.com/gem-info/color-change-sapphire/color-change-sapphire-info.php They are calling it "color change sapphire", not sure if they are hinting at it being synthetic. But it mentions colors being violet, blue and green in different types of lighting.
That's really interesting: thanks, John. The more you read about a particular gemstone, the more fascinating it becomes.
I agree! And what's fascinating is how some can look like one gem but really be completely different! Like here for example, I was sure it was ametrine and it turned out not to be. Looks can be deceiving.
0 votes
I am going to reserve my guess but ask some questions. On the setting,  do you see any marks that indicate it has precious metal? I don't see an flaws which makes me think synthetic stone. Also, due to it's size, it screams costume jewelry. Have you considered taking it to a jeweler? He could identify it without error.
answered May 30, 2016 by Weasel (40,320 points)
Hi - no, can't see any marks - it is a dull gold colour, the stone set with irregular shaped claws, and surrounded by a curious, twisted coil edging, also irregular. It doesn't look modern, or English to me - perhaps from another country? Really don't know - but it is very pretty, and I was astounded when I realised, after wearing it one evening, that when I moved into the bathroom, with a fluorescent bulb, that the lovely lavender colour had dramatically changed to blue/green.
A guess here, because of the setting, this is a piece of costume jewelry. Some of it is actually quite valuable. The metal dos not appear to be precious. The stone is beautiful even if it is paste or glass. It has no scratches. Enjoy it. Have it appraised.
Yes, I love it, whatever it is, but I would love to know something about it's history. I am trying to find a jeweller who will look at it but most here only do full evaluations for valuable diamond jewellery etc.
0 votes
If its real, it could be one of several gemstones: amethyst, kunzite, and morganite are all possibilities.
answered Jul 24, 2016 by hershel (47,740 points)

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