Diamonds? Options

[Frenchman]

So I finally got around to looking more closely at the heavies from last years panning season. I was originally panning for gold but later discovered after some research that there's almost no gold in the area where I live. However, after even more research I discovered there are numerous known kimberlite and lamproite intrusions in the crust in my area. So I went to one of these locations with my gold pan and shovel and started digging and panning in a creek downstream. I should note that my panning skills aren't the best and I might have been too careful and leaving quartz in the pan.









Pictures taken with a samsung s6 through a 15x loupe.
Thoughts and feedback are greatly appreciated!

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[Crusty]

I believe heat is another test... apply heat to it (boiling water or flame) and then touch it (or if you're really fancy, use a IR thermometer lol) and if it isn't hot, it's a diamond. If not, you'll burn your hand and be hesitant to do it again lol

[Frenchman]

Just boiled it in a glass of water in the microwave and put it straight into my mouth. At first I thought I lost it because I could not feel anything but then I realized it was just the same temperature as my mouth, which suggests excellent thermal conductivity. I'm afraid fire will damage it.