How to test for a real diamond?

posted 3 years ago in Rings
Post # 2
1786 posts
Buzzing bee
  • Wedding: September 2013

Hold it close to your mouth and scream loudly at it for 30 seconds. If it fogs up and stays that way for more than a couple of seconds, probably not a diamond. 

Post # 5
2601 posts
Sugar bee
  • Wedding: August 1987

Diamonds are great heat conductors.  Put the gem on a surface and then let it get to an ambient temperature (the same temperature as the room).  Then lean over it and without picking it up touch it with your lower lip.  A diamond should feel cold.  

This isn’t a conclusive test – you need a gemologist for that – but it’s a good indicator.  

You use your lip because this is much more sensitive to changes in temperature than your hands

Post # 6
783 posts
Busy bee
  • Wedding: September 2014

Diamond test are always free that was just a scam to get people in on for VDay.   Every jeweler (even chain mall stores) will have the hand held diamond tester.  And it will be free for it to be Tested.  

1) breath on the diamond is a good one (no screaming needed lol) Bassically if you breathe on it to get it to fog by time you stop and pull it away from your mouth you should have just time to see the stone fogging up before it goes away

2) turn it upside down on a paper with type all over it.  A diamond will not show the type but a CZ/white sapphire ect will.

3) go to a jeweler. haha  

Post # 7
1207 posts
Bumble bee
  • Wedding: November 2015

NEAM2014:  I tried this with my moissanite because I was curious. It fogged up of course when I did the breath test but when I tried to look at text, I couldn’t see through it. I wonder if it’s just because moissanite is “kinda” diamond like? I can’t figure it out…know anything about that?!

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