how can you tell when a diamond is real?
My ex was a gemologist. I think that she could spot cubic zirconia from across the room.
What goran said is true, a diamond tester tests the thermal conductivity of the specimin. Diamond has the highest thermal conductivity of any natural stone. In the late 1990s a new imposter arrived, gems made of synthetic silicon carbide which in jewlery was called Moissanite. Moissanite's thermal conductivity is close enough to diamond that testers misidentified it as diamond. It is also very hard, nearly as hard as diamond. Skilled gemologists can identify synthetic with at a loupe and there is also a tester that identifies this through its phosophorence.
My ex showed me a water test to identify diamonds but to tell the truth I don't remember the details. Your best bet is to show the stone in question to a jewler.
The easiest way is to go to a jeweler and have them check it.
They usually use a heat probe. Real stones disperse heat quickly and they won't heat up with the probe. This takes about 30 seconds and I've never been charged to have them check. It also doesn't hurt the stone the way other ways of testing will. Even if its a fake, you might still want it, so why ruin it
One more thing...
When you go to your jeweler, ask if the jewelry will always be in your presence during the exam. If the jeweler says they will not evaluate the jewelry in front of you, find another jeweler.
This is even later. I too have an Asha for my e-ring. It was the BEST decision we made. Saved us 20,000 dollars. I have even shopped for an eternity band in the highest end jewelry stores and their sales people just assume that it is real, because it looks so real that it is amazing! The only way to tell is looking through an up to date machine or having a skilled diamond dealer looking through a loupe...period!
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The scratching glass test is not dependable. Even glass can scratch glass.
Also, while diamond is the hardest known natural substance it isn't the most durable. It has planes where it can cleave (split). Handle diamonds carefully.
if it is a real diamond you can scratch it on glass or a window and it will scratch the window a little bit but if its not real it will leave a little scratch on the fake diamond!
It is my understanding if it is real it will cut glass. before you do it check out glass cutting.
When you try to break it with everything you have and fail miserably.
a real diamond doesnt scratch.