*intro music plays*
Alright everyone welcome back to Cody's lab.
So I found this supposed rough diamond on eBay
It was a hundred and twenty dollars, which is a pretty good deal for a diamond that size
And I don't really care what it looks like, I just wanted a large stone to play with and so I went ahead and purchased it.
It's not really something I could, you know, cut into a piece of jewelry or anything
But it should have all the characteristics that you would expect a diamond to have such as the incredible hardness
So that's the first test we'll do
Is to see if it is as hard as diamond.
So to test the hardness of this stone I'm going to do a scratch test.
Now I'm going to need something very hard to compare it to
Diamond is a ten and so I want to see if I can scratch something that's a nine.
This here is a piece of synthetic Ruby which is corundum, which should be a nine on the hardness scale
So let's see if the diamond can scratch it
Alright so far so good
Just wipe that make sure it's not dust
Yeah, that's a scratch. Looks like it was able to scratch the corundum so that's one point towards it being a diamond
The next test I'm gonna do is measure its density and see if that Corresponds to what I would expect for Diamond
So to do that I first need to get its mass
It's pretty easy just set it on a scale
So in order to measure the volume of this stone I'll use a little trick that I have used in another video
In which I suspend it in some water and measure the weight of the water that is displaced
So you see the wire was displacing a little bit of water there, you can actually see what the volume of the wire is
But the wire should cancel out because I've tared it and now we just put the diamond in
And we measure the volume of the diamond
For smaller stones you might have to use a denser liquid such as mercury
I suppose I could also use a clerici solution in order to measure the density of the stone
Unfortunately, I still haven't evaporated it down.
so it looks like we've got about 1.030 grams
That corresponds to about one milliliter of volume, awesome
So to find the density I take the weight in grams and the volume in milliliters
Looks like that comes out to about 3.31 Grams per milliliter
Now I believe the published value for diamond is 3.51-ish so it's a little bit under dense
My guess is the cause of that might be some, you know, voids inside of the stone.
It's not a solid crystal like there's like some cracks and holes in here
Also this value I'm sure is given a range of different densities that diamond can have
This right here is a little different, but it's not enough for me to say that this is not a diamond
It is enough for me to say that this is not say cubic zirconia or something which would be much denser than diamond should be
So, this is a checks off
So diamond is really conductive of heat, and so it will change temperature much more rapidly than say quartz
So I've got a piece of ice here
Let's stick it on at the same time and see if we got any kind of a difference
Okay
Oh yeah, I can definitely feel that the diamond changes temperature faster
Yeah, a nice puddle of water going there
Heat does transfer very quickly
Diamond should be about as conductive of heat as copper is
Body temperature, put it on the ice with the diamond. Look at that: melted right through it.
So now with the other gemstone here
Just kinda, and see I don't feel the heat at all here
Now that I've confirmed that this is a diamond, I am really curious:
Could you cut this using a water jet?
So I've come to visit the water jet guys and I'm gonna challenge you to see if you can cut that with your water jet
- I don't think we can do it but we'll see. - I think we can.
So if you guys want to see their attempt I'll link it down in the description and probably up here.
See ya, head on over there check them out
Okay, how's that?
- Okay, ready? - Yeah