*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
