Introduction: How to Make a Synthetic Diamond

Picture of How to Make a Synthetic Diamond

My 10-year Wedding Anniversary is coming up so I thought I'd make my wife something special. A few months back I'd seen a show on TV where they demonstrated how companies were now making "cultured" diamonds in the lab. There are a few different methods, but the simplest is something called "chemical vapor distillation". The process is pretty straightforward. Basically, microwaves are used to create a slurry of graphite plasma which, when rapidly cooled form a crystal structure.

I checked around on the internet and found several sites where others have been doing the same thing. The best part was that everything I'd need were pretty common household items. So, I rounded up the necessary supplies and began imagining how great life would be once I'd cornered the international diamond market.

Step 1: Materials

Picture of Materials

Here's the surprisingly short list of materials I used:

A standard home microwave oven
2 coffee mugs
3 pieces of 3mm graphite pencil lead
A few drops of extra virgin olive oil
A 5" piece of 100% cotton thread

The hardest item to find was the 100% cotton thread. It's amazing how scarce that stuff is. After searching through all of our sewing notions, I finally found some black thread that I think my mom bought back in the 70's.

Step 2: Prepare the Olive Oil

Picture of Prepare the Olive Oil

As I mentioned above, the theory behind this project is using microwaves to heat the graphite into a plasma. In general, pencil graphite is not reactive enough to microwaves. So, a thin oil is used to concentrate the heat in a specific area of the graphite. Also, as the oil heats up and begins to burn, it chemically separates the binder in the pencil lead from the graphite.

Place a few drops of olive oil onto a plate and lay the thread in the oil. The thread will absorb some of the oil.

Step 3: Transfer Oil to the Graphite

Picture of Transfer Oil to the Graphite

Lift the oily thread and tie a knot in it.

Don't pull the knot all-the-way closed!

Carefully slip a piece of graphite through the knot loop and lay both the thread and graphite on a plate. I used two halves of a toothpick to keep the graphite suspended above the plate. This helps keep the oil confined to a single spot on the graphite.

Pull both ends of the thread until the knot has closed around the graphite.

Wait about 30 minutes for the oil to soak into the graphite.

Step 4: Setup (i.e. Clean) the Microwave Oven

Picture of Setup (i.e. Clean) the Microwave Oven

I didn't really tell my wife what I was up to. (It is, after all, a surprise.) But when she saw that it involved our microwave, her response was, "please don't burn the house down."

I assured her it wouldn't, and that I'd need to clean the microwave before my "experiment." This ended her objections.

So, while the oil was soaking into the graphite, I cleaned the microwave. The sites I'd read from others folks doing this insisted that a clean microwave would yield better results. Maybe, maybe not, but it sure looks better.

Step 5: Remove the Thread

Picture of Remove the Thread

Clip off part of the thread as close to graphite as possible. Then, gently tug on the other end of the thread and pull the knot undone.

Try not to slide the thread up-and-down the graphite. Remember, it's important to keep the oil concentrated in one spot.

Step 6: Set the Graphite on the "Crucible"

Picture of Set the Graphite on the "Crucible"

Here's the ingenious part of the project. Turn one of the coffee mugs upside-down. (I used a slightly larger one as the base.)

Set 2 more pieces of graphite (non-oiled) on the upturned mug, parallel to each other.

Lay the oiled graphite across the other 2 pieces.

Place the other coffee mug over all of it.

Presto! It's a makeshift crucible!

Step 7: Place "Crucible" in Microwave

Picture of Place "Crucible" in Microwave

Place the stacked mugs into the microwave. In my setup, the large bottom mug required that I remove the glass tray.

Step 8: Start the Microwave

Picture of Start the Microwave

Set the microwave for its maximum cook time at the maximum power setting. In my case, that was 99 minutes and 99 seconds - which turned out to be long enough.

Be advised: the microwave will spark a bit where the oil has soaked into the graphite. This is normal as the oil is bonding with the binder in the pencil lead. It should stop sparking after a few minutes.

After the microwave is done, let the mugs cool completely before removing them. Remember, if done correctly, you've generated 1,200+ degrees inside the crucible. Be safe.

Step 9: Admire the Finished Product

Picture of Admire the Finished Product

After the mugs have completely cooled, remove them from the microwave.

The oiled graphite will be broken. The others should largely be intact. You'll also find a small lump, slightly larger than a grain of sand where the oiled section was placed.

Congratulations! This is the product of your labors, a genuine diamond.

I took the raw diamond to a jeweler I know and had her test it. She confirmed that underneath the scale material, there's a tiny bit of diamond material. She said that its quality was pretty poor, but it did fluoresce like a "real" diamond.

Now, admittedly, this homemade synthetic diamond is too small and too filled with inclusions to make into jewelry. But, it technically qualifies as a diamond... and I made it, so that's pretty cool.

Step 10: Make It Into a Keepsake

Picture of Make It Into a Keepsake

Obviously, this falls a bit short of what we think of when we hear "diamond". But, after posting the original article, I came up with a pretty cool way to preserve my achievement.

I filled a small washer with clear epoxy and dropped my diamond into it. After it hardened, I strung it on a chain to make a diamond necklace.

My wife was impressed. After all, how many women can wear a diamond that their husband actually MADE?


91099543 (author)2017-11-27

it realy worked

Batluc (author)2017-11-11

what on earth, this is good

Marco AlexisM (author)2017-11-10

I tried to make this but I didn't get how it went from graphite sticks to diamonds.

Dark_Touch (author)2017-03-23

While it is indeed a small diamond, it seems like it would be an ideal seed to grow full diamonds using CVD

MaryR209 (author)2017-03-14

This is amazing! Really or not if my husband went through all of this for me i would be super exicted. I think this is amazing that you thought of how to do this and actually created something. You did it. Not the earth or some super smart jackass in a lab. Kudos to you man, awesome work!

Varen Greycloak (author)2017-02-20

I'm going to attempt this in the near future with graphene, hopefully I can produce some diamond fragments. The impurities in yours were likely due to the clay and binders.

sclements3 (author)2016-12-22

amazing! such a sweet idea for your wife

ttyler333 (author)2016-09-04

Would a higher wattage microwave help? Thicker graphite pieces too? Find a way to enclose the pieces in some type of pressure vessel too?

HELLO KITTY 12 (author)2016-08-27

That's isn't helpful really ?

Dan TheD (author)2016-08-03

I'm just going to say this, this guy wanted to do something nice for his wife so he created this for his wife i am pretty sure he knows these aren't real diamonds, but if some more of you mean commenters are going to ruin his parade that not okay, just because your a diamond expert or you think that makes you intellectually Superior to others, that is incredibly stupid of you, so apparently your not, because a truly intelligent person thinks about how they would make someone feel before speaking. so knowing about something isn't intelligent as it is, you need to think about others emotions too or else your just ignorant. i am usually polite when defending others but I've seen a lot of this recently, and this still wont change the fact that some people are still jerks, but at least some people will take me more seriously if I'm a bit stricter. I'm sorry if this was a long post and this is an old topic but i just felt like mentioning this to you guys.

Cheathum14 (author)2010-04-03

I don't like being "that guy" but it seems there are plenty of others on this site so im going to say it anyway; thats not a diamond. Here are a few reasons why.
1. The pencil lead you used contains a large amount of clay, not just graphite.
2. Microwaves are not capable of generating the heat neccesary to recrystalize carbon.
3. Even if the microwave could reach the neccessary temperature, the pressure required to make a diamond is around 50,000 to 70,000 times that of earth's atmosphere.
4. How is it that you claim to have made a diamond in your microwave if diamonds weren't even synthesized until 1953, six years after the first microwave oven was made? If they had the technology in 1947, why not use it then?

Sorry for pooping your party, but it looks like im not the only one.

goblin072. (author)Cheathum142016-05-06

Wow way to rain on his parade man, he worked hard on that. Are you some kind of Diamond expert have you even been in a Diamond mine?

KevinO56 (author)Cheathum142016-04-08

um................ maybe because they did not know how to

Treknology (author)Cheathum142010-04-28

Let me bomb your party.

1. A real diamond placed in a CO2 atmosphere will dissolve into "nothing"--no pressure or heat involved.

2. Fake industrial diamond is not manufactured under such high temperatures or pressures either.

3. An Australian high-school student developed a way of coating materials in diamond micro-dust, using COLD and low pressures--great for making grinding wheels but hopeless for laser focusing devices.

Superheat and pressure is only theory.

CaneR1 (author)Treknology2015-12-26

Do you even know what Diamonds are?

1) If diamonds dissolved when introduced to a C02 atmosphere then there would be no practical way to handle nor create them.

2) 'Fake' or cultured gem-Diamonds of the 21st century are manufactured by either CVD or HPHT (Chemical Vapor Deposition or, High Pressure, High Temperature respectively) CVD is used to produced 'Gem' Quality Diamonds en masse at an increased albeit profitable expense. HPHT is used to create diamonds for industrial use, this is a rather old method it operates very efficiently.

3) You can make 'diamond' micro dust with borax and Pipe cleaners. Arguing nomenclature is fruitless but the point being, diamonds are assigned arbitrary value and significance.

4) His method is crude, but it follows procedure. Graphite is used to cause a reaction between a Hydrocarbon (like methane) and atomic hydrogen once the latter is turned into a gas which then should bond with the Hydrocarbon and then once it dissipates you have a Diamond. For a gem quality diamond to be produced you need to have a temperature range of 900 - 1200 degrees celsius.

mrcrumley (author)Treknology2010-04-28

And let me party on your bombing: You're not the first person to point this out.

crystal power (author)mrcrumley2015-12-17

I like that idea so I want to do that

Treknology (author)mrcrumley2010-04-29

I was bombing Cheathum14, not you. But I do re-assert that extreme heat and pressure will not be the methods by which "gem" quality diamonds are reproduced--and even then they won't be "gem" quality because they will lack the unique flaws of the natural product.

Of course, if subsequently worthless "pure" diamond can be grown then lenses and other optics will take a massive left turn in efficiency. And yes, I confidently predict that such method will not only validly suck carbon out of the atmosphere, it will turn out rocks in such volume that the South African economy will collapse.

mogg (author)Treknology2011-01-14

Synthetic diamonds are made at about 300deg C, but usually in a pressure vessel using microwave radiation and a "seeding" crystal. You can make diamond as big or small as you want by growing them in a chemically neutral environment (nobel gas/ nitrogen) using CO2. Check out wikipedia, has an article about them. The diamonds are purer than natural sourced diamonds, and are currently being applied to electronics, especially light based circuits.
Go to a big jewelers and ask for yellow diamonds- they are tinted to distinguish them natural ones, but they can come in any colour depending on the material you poison the crystals with. They have the same colour as urine.
I haven't tried it, so can't say if this will work, but I'm skeptical of the chemistry.Once I've destroyed my microwave (it's crap anyway), i'll let you know. (^^) (author)mogg2015-01-29

Synthetic diamon can be made on 2 method:

- CVD (chemical vapor deposition)

- HTHP (high temperatures - high pressure)

Read more about Grown diamond made on CVD process. You can watch video:

mrcrumley (author)mogg2011-01-18

I think I've mentioned this before, but I haven't read if it's been tried: perhaps a greater pressure could be achieved by incorporating a vice in the process... and maybe a tiny (yet strong) person to crank it - just an idea.

mrcrumley (author)Treknology2010-04-29

 Maybe... but they'll always have the World Cup.

Synthetic diamon can be made on 2 method:

- CVD (chemical vapor deposition)

- HTHP (high temperatures - high pressure)

lucek (author)Treknology2014-05-21

You can make industrial daimounds with TNT. Does that mean that they started doing so in 1863.

zoteman94 (author)Treknology2010-10-26

It isn't only theory, graphite is the most stable allotrope of carbon at ambient temperature and 1atm pressure. (Yes you can convert diamond into graphite in an inert atmosphere at around 1000°C) Maybe there are some ways that don't need ultra high temperatures or pressures, but it is proven that diamond is more stable than graphite at these conditions and thats why it transforms into it.

Cheathum14 (author)Treknology2010-05-09

You didn't quite bomb my party. I know that diamonds can be formed at much lower temperatures and pressure.(Microscopic diamonds can form on the surface of the sun where the temp. is only 10,000 and where there is little pressure) I was just saying that for a diamond of that size (visible to the naked eye) to be formed, it would take more than the pressure and heat a microwave can generate. Also, if i'm wrong, so be it, i'm only a sophomore in high school anyway and i'm taking physics next year.

JacobD7 (author)Cheathum142015-08-16

your obviously using something you thought up off the top of your head, that sounded OK (i guess) but theres no references or pictures HE HAS PICTORAL PROOF AND GOT EXPERT OPINION im gonna need more evidence to back up your 'claim'

Marik I. (author)Cheathum142012-12-06

I agree with you. I saw an episode on Nova scienceNOW on how these people can manmake real diamonds. It was so private, the host and the whole camera crew had to be blindfolded for the ride there and back. Also they use these obviously expensive machines with a "secret recipe" they called it. Scientists wouldn't pay that much if they could just use a microwave.

owlart101 (author)Cheathum142012-04-05

Dude, its a prank.

KimberlyP (author)Cheathum142011-04-30

Apollo Diamond

You could use a microwave and an Absorber such as Silicon Carbide to absorb the microwave radiation and convert to heat.

You would need much lower pressures but you would have to have a controlled atmosphere to the Silicon carbide chamber and that chamber would have to have a suitable refractory and need to be kept cool such that its heat up does not cause ionization which results in it absorbing microwaves and heating up as well.

Apollo Diamonds are gem perfect they can only be identified by lack of any defects. Of Course if done at home you could vary input defects theoretically and they could never be identified.

Microwaves are ideal in this process because of the tight control of temperature in connection with the absorber. It is also more energy efficient.

KimberlyP (author)Cheathum142011-04-30

Microwaves with a suitable absorber. Silicon Carbide, Zirconium Oxide, Plutonium Oxide and others, can absorb nearly 100% of microwave radiation.

They heat up and radiate in infrared. You need a suitable refractory and you probably want to keep it cool so that it does not heat up and ionize and start absorbing microwave energy.

The temp is achievable.

For small crystals you could use cavitation and therefore not need the high pressures. The crystals would be very small.

For Large crystals you need not have as high a pressure but you do need a controlled atmosphere.

They were using microwaves as early as 1953 at Y-12 to deal with radioactive materials processing.

You may have made Silicon Carbide in a process similar to the Acheson Process if you arced in non controlled atmosphere.

barkbark (author)Cheathum142011-01-29

About the microwave..I'm thinking that a discovery of diamond-making need not come out the second the microwave is launched..people were pretty freaked by them.. Microwaves for food uses anyway because they were scary..
Hitler refused to allow his troops to eat food cooked it them because they were proven to mutate protein, and mutant proteins become cancerous, still a researched and proven fact, the old documents are still around for public review, online. Microwaves were around in studies years before they were launched, but they recieved passage into the public through a manipulative buy-off, against the will and recommendation of the reviewing doctors of the day on the panels.

So heads were not all about playing with microwaves in popular masses. A few were daring to launch experiments, but its main intention had some sinister purposes even though it was promoted for cool ones. Diamonds on the other hand would've been a lighter area of creative experimentation, dangerous as all science can be. I wish I'd known about the diamond thing earlier--it would've been fun to work with :D! Glad I no longer use a micro, though..

mrcrumley (author)Cheathum142010-04-04

Your response was more thoughtful than the usual, so allow me to retort:
If the "clay"in question is Clay Aiken, that only strengthens my case - his voice is like diamond.
Maybe you didn't notice the "doneness" button on my microwave... I think it goes to "11."
I assure you that the pressure I was under from my wife to NOT burn our house down exceeded 70,000 bars.
In 1953, President Truman announced we had developed the bomb. Later that month, Arthur Miller's "The Crucible" opened on Broadway. That's just too much of a coincidence for me to believe diamond-microwave technology hadn't been discovered.

Also... you should read the other comments to see how this story ended.

Cheathum14 (author)mrcrumley2010-04-05

:) Well played. I thought there was something odd about this instructable. Also, pranking me isn't quite that difficult because im the most gullable guy in my county.

aqwiz (author)Cheathum142010-04-15

 I hope you don't live in poland. 

Cheathum14 (author)aqwiz2010-05-09

haha, i live in texas and i'm gullable, not stupid :)

aqwiz (author)Cheathum142010-05-09

 Oh my bad I misread that, thought you said country. 

Mr. Potato Head (author)aqwiz2010-09-24

Guess that makes you the stupid one!

dgdgdgdg (author)2016-04-27

Your wife is one lucky lady.

KevinO56 (author)2016-04-08

how much is it worth

KevinO56 (author)2016-04-08

how much is it worth

Ivanfetita (author)2016-03-08

Lol, the worst thing's that it worked

Ivanfetita (author)2016-03-08

Wait, is this dangerous? I am so stupid I did it.... For a sec until i saw sparks. I mean
.... Could it ruin my microwave???

Ivanfetita (author)Ivanfetita2016-03-08

Please, reply

Ivanfetita (author)2016-03-08

Wait, is this dangerous? I am so stupid I did it.... For a sec until i saw sparks. I mean
.... Could it ruin my microwave???

Ivanfetita (author)2016-03-08

You ruined my microwaves oven ;(

AndreasF13 (author)2016-02-06

does it actually work and how much is it worth? (plz only tell me if it works if u tryd it)

Yonatan24 (author)2016-01-16

This is a great idea!

A great prank idea! (and now almost a million views)

Sorry I ruined it :)

sexygirl123 (author)2015-11-19

I don't care enough to get pedantic about your methodology. I'm just glad you're not my boyfriend.

you are verrrrrrry rood

About This Instructable




Bio: (Is there a word that means more than "ultimate"? Oh well, I'l just make one up... "omnilent") Omnilently creative, MrCrumley fights a daily battle ... More »
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