HPHT Lab diamonds cvd closely replicate the natural diamond-growing process deep beneath Earth’s crust. As this method requires more complex equipment and more energy consumption than CVD methods, its costs also tend to exceed them.
Although growth method should play an integral part in choosing a lab grown diamond, its beauty should ultimately be your sole deciding factor! As long as it fulfils all your needs and priorities, then all is good!
Actually, both hpht vs cvd diamonds look equally beautiful, making either method an equal option when it comes to aesthetics and cost effectiveness. Companies that push one method over the other often do so to increase sales without objectively comparing processes.
CVD technology relies on creating diamonds through interstellar gas clouds, using less pressure and smaller machinery than HPHT methods. A small piece of diamond seed is placed inside a sealed chamber along with methane gas which has been ionized using microwaves or lasers into plasma; carbon atoms then combine with seed crystal to grow one crystal after another until eventually producing diamond crystals atom by atom.
Some CVD diamonds may display strain lines due to their chemical structure, which can affect clarity grade. Such diamonds must undergo post-growth treatment in order to eliminate strain lines.
Both CVD and HPHT methods produce diamonds which are optically, chemically, and physically indistinguishable from natural or mined diamonds. Indeed, it would be impossible for anyone with the naked eye to differentiate the two.
Both CVD and TGD methods use superheated gas to stimulate and grow a small diamond “seed” into an entire gem, but CVD was the first technique to produce colourless lab grown diamonds – thereby making this process both cost-effective and quicker.
CVD uses a plasma cloud of methane gas that vaporizes into carbon atoms that fall on a seed crystal to create synthetic diamond. As part of its structure, this type of diamond may also contain boron; upon testing with a Moissanite tester it would test positive as Moissanite; its presence may even produce strain visible under a microscope as metallic sparkle in transmitted light detectable by polarizer.
Noteworthy is the fact that both HPHT and CVD lab diamonds can produce flawless, colourless gems using similar ingredients and methods of production.
The only difference between them lies in their manufacturing methods; CVD diamonds tend to have more yellow and brown tones and also exhibit strain lines (a white pattern seen on high quality photos taken using cross-polarizers).
As plasma is used to form diamond layers, its use may leave them with an almost-hazy look; this does not have an adverse impact on clarity grading; in fact, fuzziness may even improve it by concealing inclusions more effectively.
Diamonds can be created in the lab using either of two main successful processes – HPHT or CVD – which produce high-quality lab grown diamonds that resemble those found naturally, chemically, physically, and optically.
Only difference lies in their growth patterns; an expert could easily tell whether a lab diamond was HPHT or CVD by looking at its shape (HPT grows in a cuboctahedron with 14 growth directions while CVD crystallizes cubically) and crystal structure.
Keep away from retailers such as James Allen that do not disclose whether the lab grown diamond is produced via CVD or HPHT processes, but provide their diamonds with a lab certificate detailing this fact.
The diamond supply chain involves many people as mined diamonds are transported from mines through multiple steps before reaching jewellers – this contributes to their high prices; lab-grown alternatives do not necessitate mining natural resources and thus present less of an environmental risk.
HPHT and CVD diamonds differ primarily in their crystal growth pattern, making identification easy for lab diamond experts. HPHT diamonds feature an irregular cuboctahedron structure with 14 separate directions of growth while CVD diamonds have cubic forms with only one growth direction, sometimes leading to strain symptoms for CVDs.