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I think by fake diamonds it meant zircons?Sorry, forgot to put the correct brain in this week.Bee
Wait.. you put "Me on the loo".. But aren't you taking the photo?  LOL
I think Seany meant that as you were on the loo then who took the photo! 
Oh, LOL! You thought that I wanted a picture of you in the loo?! LOL 
Oh Boy, I can see the punchlines looming but here we go.The glow from things like this doesn't last long- sometimes just milliseconds (sometimes less but you wont see that). Rather than leaving them to soak up light while you go to the loo try flashing them. Right, that's definitely flashing not flushing. No I don't want any pictures of you flashing.Get a flash gun for a camera. You need the sort that you can flash as a "test". Then the silly bit. In a dark room close your eyes, wait a while and flash the gun at the rocks then, after you see the flash open your eyes and look at the stones in the dark to see if they glow. An afterglow that lasts long enough to do this is called phosphorescence.The idea is to get your eyes dark-adapted and keep them that way; closing them might do the job but you also might need to put your hand over your eyes too. Because the flash is so bright you will see it even with your eyes shut so you know when to open them. Don't look at the flash with fully dark-adapted eyes; at best it will hurt, and you might damage your eyes.Or it might be easier to see if they glow under UV light (the stones rather than your eyes).That will tell you if the stones are fluorescent but I'm not sure how much help any of this is in judging their authenticity or value; see this sitehttp://www.thediamondbuyingguide.com/diamond-fluorescence.html(The real differences between fluorescence and phosphorescence are more complicated han just a matter of how long the light lasts but I'm tired and I want to go to bed rather than write lots of stuff about photoluminescence)
Thanks Bored chemist for the explanation and Neil for the test.Looks like I got it ars, er the wrong way round.Now what is that saying "a little knowledge.........." Bee
Gwrr.. I wish there was a glow! It would have been awesome 
LOL! Shove it in a furnace, 
Zirconia melts at 2715CHot, but not millions of pounds worth of hot.