How to Make a Synthetic Diamond
Intro: 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.
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
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.
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
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.
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
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.
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
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.
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
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.
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"
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!
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
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
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.
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
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.
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
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?
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?
402 Comments
sadness2 3 years ago
fortyb4five1 3 years ago
Cheathum14 14 years ago
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.
liondog96 3 years ago
Treknology 14 years ago
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.
samuelx3 3 years ago
CaneR1 8 years ago
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 14 years ago
crystal power 8 years ago
I like that idea so I want to do that
Treknology 14 years ago
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 13 years ago
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. (^^)
anakonda.store 9 years ago
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: https://www.youtube.com/watch?v=D0mwwiHd9BA
mrcrumley 13 years ago
mrcrumley 14 years ago
anakonda.store 9 years ago
Synthetic diamon can be made on 2 method:
- CVD (chemical vapor deposition)
- HTHP (high temperatures - high pressure)
lucek 9 years ago
You can make industrial daimounds with TNT. Does that mean that they started doing so in 1863.
zoteman94 13 years ago
Cheathum14 13 years ago
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.
_willow_ 3 years ago
MarioL111 6 years ago