How to test a diamond with water (Part 2/3)

How to test diamonds with water and heat!
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How to test diamonds, the dot test https://youtu.be/kstRvelnCO4
How to test diamond with sandpaper https://youtu.be/5XjZzbwunbE

0:00 How to test a diamond with water
0:18 Can diamonds float on water?
1:20 How to test a diamond with water and heat
3:20 The Results

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I dropped a diamond and cubic zirconia in a glass of water to see if they sink to the bottom.
Due to its high density, a real diamond will sink. A fake one will float at the top of the surface or in the middle of the glass. I tried this and it did not work

Then I tried

Heating up the two stones and to see if which one shatters. Heat up a suspect stone with a lighter for 30 seconds, then drop it straight into a glass of ice-cold water.
The rapid expansion and contraction will overwhelm the tensile strength of weaker materials like glass or quartz, causing the stone to shatter from the inside.
Real diamonds are strong enough that nothing will happen and by doing this test I found a result.

In this video, I used a diamond and cubic zirconia. I will get moissanite in upcoming videos
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Видео How to test a diamond with water (Part 2/3) канала Sasho