How to make a diamond

Research commissioned by the Diamond Trading Company shows that 94% of women prefer natural diamonds to synthetic ones.

Diamonds

However for the remaining 6% there are two established ways to make your own diamond.

The first way, first achieved by Swedish company ASEA in 1953, and then by GEC in the US involves using large pressures and temperatures. Synthesis takes place within a cylindrical capsule containing a source of carbon, a solvent catalyst made from cobalt, nickel and iron, and a seed crystal. The capsule is placed between an anvil and die made from tungsten carbide at a pressure between 5 GPa and 7.1 GPa (50 000 to 70 000 atmospheres) and temperature between 1200 and 1500 oC. A temperature gradient of a few tens of degrees can help growth from the seed diamonds. These high pressure high temperature (HPHT) techniques can grow diamonds from a few hundredths to a few tens of carats. With the largest commercially available diamond being 3 carots (0.6 g).

Uncut HPHT diamonds differ from natural diamonds in there external shape. HPHT diamonds have a cubo-octahedral morphology as opposed to the octahedral morphology of natural diamonds. After cutting the original shapes can be distinguished because the uptake of impurities is different in different growth directions. Individaul faces exhibit different colours or fluoresence intensities. Some HPHT diamonds will exhibit strong fluorescence due to electronic transitions at atomic impurities containing nickel or cobalt from the solvent during growth. Inclusions of titanium or zirconium metal can also be trapped in the diamond when they are added to limit discolouration of the diamond by the prescence of nitrogen.

Chemical vapour deposition (CVD)
Another way of making diamond is to form a plasma from carbon-containing gas which is then deposited onto wafers of synthetic diamond. Carbon is initially deposited as graphite, but hydrogen etches away any graphite that is formed during deposition leaving only diamond structures behind. The ability to produce extermely high-purity diamonds with well-controlled doping makes this the preferred route to explore future technical applications such as electronic devices.

Links:
Transcript of the Diamond Makers, 1999 BBC Horizon

24 Responses

  1. … and 94% of women have probably not thought about where ‘real’ diamonds come from, the trouble they cause, and how little they’re genuinely worth

    … and 100% of women probably can’t tell the difference between a fake diamond and a real one anyway.

  2. And a more recent article, showing nothing has changed in the 20 years since the one I posted earlier.

  3. So 96% of women are spoiled vain bitches, who care nothing about the crooked economics of diamonds?

  4. No, ninety-four percent.

    I think there is a missed marketing opportunity here, I mean how much better is it to have something that was created especially for you rather than just dug out of the ground.

  5. While some of us can tell the difference between fake and real diamonds, there is no doubt this industry thrives on scams. And the scams can be pretty sophisticated.

  6. I agree with Rich. These diamonds are just as real, just man-made…that are even MORE perfect than the natural EXPENSIVE ones. Must we really pay hundreds of dollars for something to “oohhh” over that we can get for better deals?

  7. I agree with the Rich and Jo, they both seem like really great guys to.
    Get back to me sometime! (wink wink)
    825-2034
    ask for Cole

  8. tq 4 being such a good resources

  9. I don’t know what your talking About:)

  10. Don’t know if you have noticed, but these man-made diamonds are not cheap. We are not talking cubic zirconia here.

  11. You suck and that is not wherethey come from

  12. Dimonds I wish I had one. My mom has a dimond necklace but she dont want anything happening to it. So yeah. But my dad told me if we go to Australia theres some mines there that had dimonds and stuff. Were learning about mining in school.

  13. I read about where they come from, you need to find a place where the volcanic activity has pushed up material from deep below the ground. It would be cool to know more about Geology, I read a geologist found diamonds in north america in the last few years, now it seems almost every country can find them.

  14. well just to let you all kno
    i no how to make them just go to… how to make diamonds in the microwave.com
    it may sound like a piece of shit but it works

    P.S hey just puttin this out there…DIAMONDS COME FROM THE F***IN MINERAL IN CHARCOAL!!!And if anyone got anything to say dont bother saying it if you want your face punched in!

  15. Is it just me or can men actually tell a fake from a real diamond better? Because my girlfriend is an idiot… I gave her a crystal ring and she thought it was made of diamonds. Besides I agree with Rich real diamonds cause to much economical comotion and is horrible for black African slaves / POWs.

  16. I was read a geologist found diamonds in North America in the last few years, now it seems almost every country can find them.

  17. ok well this is not real it was on mythbusters and it fake

  18. Which was fake, about finding a diamond in North America, or making a diamond in the microwave? I think graphite should be stable at atmospheric pressure, microwave might be a good way to make graphite from diamond.

    High pressure manufacture is possible, just replicating what happens in nature. It is also possible to make diamond by chemical vapour deposition, which i think is amazing, because i don’t understand how it works.

  19. pls how do i get the wafers of synthetic or diamon seed silver???? or how do i make it

  20. I agree with Rich. These diamonds are just as real, just man-made…that are even MORE … ones

    Diamond jewellery site is best for solitaire rings, Antique Cut diamond Pendant necklace set, victorian jewellery diamond brooches, diamond tiaras, estate jewelry, nose ring, rings, religious jewellery, Solitaire Rings, Diamond Ring, Diamond Earrings

    http://www.diamondjewellerysite.com

  21. I guess I am in the 6% — I prefer man-made diamonds — they are just as beautiful and no one dies or suffers… if you have never watched “Blood Diamond”, you should.

  22. Wouldn’t it be a great idea if they made trash into diamonds? That would free up landfill space AND add some sparkle into the world. What’s one man’s trash can be another man’s treasure. Although I do not know how expensive the procedure is, it think they should do it.

  23. you order not to say how to do or make diamont and people has been saying or bribeing and i hate it

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