2.0-2.5 ct HPHT DEF color rough diamond lab created diamond raw
stones for sale
HPHT VS CVD?
As we know that there are two methods for producing lab
grown diamonds, high temperature and high pressure and cvd.
Which of these two methods is better for cultivated diamonds?
HPHT Technology: The high temperature and high pressure technology completely
simulates the growth process of natural diamonds, reproduces the
reaction of the carbon element layer on the ground and converts
graphite into diamonds.
HPHT method (temperature 1 400 ℃ -1 700 ℃, pressure 5.2GPa-5.6GPa)
Diamond refers to an environment that simulates the growth of
natural diamonds, in a hexahedral high-pressure machine, graphite,
diamond powder or graphite-diamond powder is used as the carbon
source , The equiaxed crystal system formed in the growth
environment of high temperature and high pressure, metal catalyst,
etc. It only takes a few weeks to produce 20 carats of cultivated
diamonds using the high temperature and high pressure method.
The growth process is to put high-purity graphite as a carbon
source in the high temperature zone of the growth chamber of the
top press, and place diamond seeds in the low temperature zone.
Driven by a certain temperature gradient, the carbon source
diffuses from the high concentration area at the high temperature
to the low concentration area at the low temperature. The diamond
seeds in the low temperature area are supersaturated and
crystallized, then cooled and taken out, and concentrated nitric
acid is used to remove the diamond surface impurities.
CVD Technology:Usually under the action of high temperature plasma,
carbon-containing gas is dissociated, and carbon atoms are
deposited on the substrate to form a diamond film.Single crystal
diamonds are usually formed by the deposition of carbon atoms on
the diamond substrate. Carbon-containing gas usually refers to a
mixed gas containing nitrogen, methane and hydrogen. Methane is the
source of carbon atoms in the synthesis of diamonds. Nitrogen can
increase the growth rate, and hydrogen can inhibit the formation of
graphite. Usually CVD synthetic diamond is carried out under low
pressure and high temperature conditions, the pressure is generally
less than one atmosphere, and the temperature is about 1 000 ℃.
From what is said above, we can draw a conclusion:Both technologies
have their own advantages. HTHP has higher efficiency and better colors, and CVD has better purity. The production of 1 carat cultivated rough diamond, because high
temperature and high pressure (HTHP) is formed by the connection of
carbon atoms and carbon atoms, so the growth cycle only takes a few
days. Chemical vapor deposition (CVD) is to dissociate and grow
carbon-containing gas on the seed wafer, and gradually accumulate
and accumulate, which requires a growth cycle of several weeks.
Because high temperature and high pressure (HTHP) requires a metal
catalyst as a solvent to participate in the reaction, it will have
some impact on the purity of the diamond, and the purity of
chemical vapor deposition (CVD) is slightly better.
Specification
| Item | Value |
| Brand name | Yuda Crystal |
| Model number | YuDa-HPHT |
| Place of origin | Henan,China |
| Diamond weight | 2.0-2.5ct |
| White diamond color | D E F |
| Diamond clarity | VVS VS SI |
| Payment term | 100% payment |
| Shipping ways | DHL,FEDEX,UPS.EMS |
| Delivery Time | 1 - 7 Working Days Base on Order Quantity |
Lab grown & natural diamonds
There is no obvious difference between the Rough Lab Grown Diamonds
and natural diamonds. Even professional gemologists need special
equipment to identify them. By zooming in, professionals will be
able to discern subtle contrasts in diamond inclusions grown and
mined in the laboratory.
| Lab grown & natural diamonds |
| lab grown diamonds | natural diamonds |
| grown in a lab | mined from the earth |
| created in months | created over billions of years |
| offer incredible value | prized for their rarity |
Who are we?
Henan YuDa Crystal Co., Ltd. are based in ZhengZhou city.We are
specialized in the export and import business of lab grown diamonds
more than 10 years. YuDa is a professional company in all synthetic
diamond applications, our main products are cvd diamond, hpht
diamond, and customized diamond by your requirements. Our products
enjoy a good reputation and are sold to Europe, America, Southeast
Asia, South Africa and other countries and regions.
FAQ
Q:Do you provide samples? Is it free or not?
A: Yes, we provide samples,but not for free.
Q:What are your terms of payment?
A: We accept Paypal,T/T,Western Union and MoneyGram.
Q: Which express company do you use?
A: As usual we used DHL,UPS ,FEDEX Or Brinks.
Q:How can I contact with you?
A:My email address:lydia@yudacrystal.com/whatsapp+8618595922359
Lab Grown Rough Diamonds Details
