What is the Best Way for a Do-It-Yourselfer to make a few good Diamonds? Can I just Heat some Methane and add Water?

I'm looking for practical ideas and expertise with making such things.

I have a Wood Furnace that gets hotter than 1000 F and a tiny Camp Stove burning Pellets. 

I have Propane for the Carbon. Water could be used to a little Hydrogen or Oxygen.

I would like to make a 1 carat Round Brilliant Cut perfect Diamond and a 1 1/2 inch Maltese Cross looking Diamond as perfect as possible.

I believe I could make the 1 carat Diamond in a 1/2 inch tube using a low quality Diamond as the substrate and target at the end of it. I would have to activate the gas mix moving through the tube just before the substrate. Do I need a Microwave or UltraViolet Light or something?

I need some Know-How and Inspiration.

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kelseymh7 years ago
Why do you ask if you already know the answer? Trolls are not fun, and deserve to be mocked and flagged.
Zues.gods (author)  kelseymh6 years ago
Dear kelseymh:

I am new to Instructables and may have personally offended you or others in some way without intending to. I'm very sorry if I did so.

I am not inviting anyone to mock me or this question. I guess I don't know what 'flag' means in your context, but I assume it is a four-letter word and can not be a good thing.

I guess you thought I ment something else, but this is what I intended:

I would like to understand how beautiful diamonds, say 1 carat, can be made with possibly a Chemical Vapor Deposition or Electrodynamic Deposition method or other method.

I understand there probably are Phase Diagrams for carbon at different temperatures and pressures and possibly varying over time that might be available somewhere. I understand in a reducing atomosphere, possibly with a catalyst or diamond seed, that possibly the diamond phase of carbon can be deposited at about 1000 C at 1 atmosphere pressure.

I understand naturally occuring diamonds were formed at very high pressures and temperatures.

I have been interested in enzymes for making fuel alcohol at low temperatures and the possibility of making jewelry grade diamonds with enzymes seems within the range of an imaginative mind. I imagine a lump of high grade diamond formed on a 'seed diamond' in a mix of gases, which would then be cut to any of the forms diamond can be cut to.

Below this space for my Reply I see a "be nice' policy. Is it your intention to play nice? Zeus.gods
I wasn't as polite as I could have been. You asked an extremely vague question, with none of the detail you have just provided.

Generally speaking, people ask questions when they want information which they don't have. In your "related"/"keywords" list, you provided a perfectly reasonable answer to your vague question, namely CVD. That sort of "game" (asking a question where you already know the answer) is a fair waste of other people's time, and dsrespectful to them.

It would be excellent if you edited the text of your question (look for the edit topic button to the right of the title) to include all of that additional information, so that other readers can see it as well.

Depending on your level of expertise, the Wikipedia article on CVD diamonds (and links from it) may be sufficient to address your questions, or you might prefer to use Google Scholar to look up current research papers in the field.

You can easily find the phase diagram for carbon using Google. Many of the links will include descriptions and discussions of the phases, not just the plot.

Zues.gods (author)  kelseymh6 years ago
Thanks. I have been reading. I found something called a 'Beckmann Diagram' I think, that gives the relationship of Hydrogen, Carbon and Oxygen that have been found to produce metastable Diamonds at relatively low temperatures and pressures. No one would have guessed by just looking at the Phase Diagram for Carbon, at Equilibrium Conditions that has been used for Natural Diamonds.

There is so much I don't know about Diamonds, so I don't know how to respond to your comment about 'If I already know the answer."

One time I was asked by Boeing to come and talk about their B-757 Aircraft Program for my company. They didn't want to use my company's soft engine mounts, but they had a problem. The were designing the Nacelle too close to the Engine for soft mounts, but they had a vibration problem that would make the cabin too noisy at high-altitude cruise. This boiled down to the idea they wanted a soft engine mount that did not deflect. That means a soft spring that does not deflect. I developed an abiding faith that this problem could be solved within the very limited space they had. I took it to three Senior Design Engineers and after understanding the problem and thinking, they each said in turn, "You can't have your Cake and Eat it Too.' This question came up about 'If you know it won't work why are you asking me?'. So, I took all the ideas they had discussed and with my spark of blind faith, I solved the problem and took it back to Boeing. They had already moved forward so they couldn't use my creative idea but they praised me for my creativeness. The 757 still has that anoying noise at high-speed cruise. It is not my fault, I tried.
You write, "There is so much I don't know about Diamonds, so I don't know how to respond to your comment about 'If I already know the answer.' ".

Sorry, I was positing a hypothetical. The way you had originally written the question -- "How do you make diamonds?" with no explanatory text, and "chemical vapor deposition" in the keywords, made it sound like you already knew the answer, and were just jerking us around.

As you have explained very well (and thank you!), that was not true! In fact, you were asking for more detailed information about the CVD process. And thank you also for updated your question text to make that clear.
Zues.gods (author)  kelseymh6 years ago
Thanks for your help.

I think the Backmann Triangle diagram kind of solves it for me.

It looks like any of various torches or plasma cutters could be programed or premixed to generate the various flow concentrations of hydro-carbons needed; such as Hydrogen gas, methane, acelylene, carbon monoxide, carbon dioxide, or acetone.

I could use a molybdenum target with nobel gas cooling and substrate of diamond plate or a cheap synthetic or natural diamond with the right chrystal orientation to grow the round diamond I want.

The cross shape I want might just need a different shaped nozzle.

I will need to see how easy it is to pull all of this stuff together and use it a bit before I make an Instructable about it.

Thanks again, I give Best Answer.
The way I make diamonds is similar to the way I make squares. I make a 4-sided polygon, with all 4 sides of equal length. The difference when making diamonds, is that I don't worry about making all the angles be right angles like I would with a square. A picture of this is attached.
+1 BEST ANSWER bar none!!
Zues.gods (author)  RedneckEngineer6 years ago
I don't understand?
You beat me to it. Darn.
Zues.gods (author)  Jack A Lopez6 years ago
Jack A Lopez,

Thanks for your answer. I was thinking of jewelry grade diamonds. Zeus.gods
Yeah... you meant carbon diamonds, the synthetic kind. It looks tricky. But you shouldn't get discouraged just because people think the thing you want to do is impractical or impossible.
Zues.gods (author)  Jack A Lopez6 years ago
Thanks - Jack! :)
isn't that shape called lozenge?
You are correct sir.  That shape is indeed called a lozenge, but you know, for the joke to work I had to call it a diamond.  Also I think the word rhombus would be better math lingo for a general polygon with 4 sides all of equal length.  For the special case where the inside angles are 60-120-60-120-degrees, i.e. two equilateral triangles placed back to back,  then this shape is called a 2-amond, also known as a di-amond.  You can find some pictures of the other amonds here.
Yeah, I was thinking more heraldry than mathematics or geometry, that's where I first heard of it.
rickharris7 years ago
You don't - Nature does. Compressing Carbon under impossibly high pressure deep inside the earth then heating to volcanic temperatures - allow to cool slowly and you may have a diamond.
Zues.gods (author)  rickharris6 years ago
rickharris, thanks, but I was thinking of the man-made type of diamond and how that might be done.
lemonie7 years ago

Dissolve carbon in molten iron, and crystallise out of that.

Zues.gods (author)  lemonie6 years ago
Hi lemonie, I have heard of hydrogen causing emprittlement in iron, when hydrogen is trapped inside the cooling iron and then it cracks the microstructure of the iron by its pressure atomically. I guess if hydrogen has enough pressure to do that it might have the pressure to form a few molecules of diamond at the same time. But I also understand the reason people don't use diamond for cutting tools on iron is that the carbon can be dissolved very easily. But I guess if the cabon-iron solution were of a high enough concentration it might crystallyze out carbon (as diamond) instead of just dissolve it. Zeus.gods
caarntedd7 years ago
With money.
Zues.gods (author)  caarntedd6 years ago
Thanks, I guess. I'm too old to use my looks, so its either money or think of some clever means to precipitate them.
I'm sure Superman has a how to up somewhere.