3.0ct - 4.0ct Square Shape CVD Lab Grown Diamonds for Making Lab
grown loose diamonds
CVD Lab Grown Diamonds Description
CVD stands for chemical vapor deposition, which is another method
of making diamonds in the laboratory. The growth of this kind of
diamond requires proper pressure and temperature of the hydrocarbon
gas mixture in the vacuum chamber.
CVD diamond growth process
Place the diamond seed in the diamond growth chamber.
A carbon-containing gas is injected into the growth chamber.
Heat the growth chamber to 900-1200°C.
The microwave beam causes carbon to fall from the plasma cloud and
deposit on the seed crystal.
Every few days, the diamond is taken out, the top surface of the
diamond is polished, and the non-diamond carbon elements are
removed from it, and then returned to the growth chamber. Each
batch of diamonds may need to go through several start/stop cycles,
and the entire growth process takes three to four weeks.
After taking out the synthetic diamond crystals, these crystals can
be cut and polished to make the final product.
In detail, CVD diamonds are grown in a vacuum chamber filled with a
mixture of hydrocarbons (such as methane). An energy source (such
as a microwave beam) breaks down the gas molecules, and the carbon
atoms are adsorbed down to the flat diamond seeding disk at a lower
temperature. The crystallization process takes several weeks, and
multiple crystals grow at the same time. The exact number depends
on the size of the vacuum chamber and the number of seeding discs.
Such plate-like crystals usually form rough edges of black graphite
that need to be removed. They will also appear brown, and this
color can be removed by heat treatment before the gem faceting
step.
Parameters of CVD Lab Grown Diamonds
| CVD Lab Grown Diamonds Details |
| Brand Name | Yuda Crystal |
| Name | CVD Lab Grown Diamonds |
| Diamond Color | EFG |
| Diamond Clarity | VVS-SI |
| Diamond Carat Weight | 3.0-4.0carat |
| Diamond Cut | Round and fancy cut |
| Technology | CVD |
| Size | Customization |
| Shape | Round and fancy cut |
| Application | For Cutting Lab Grown Loose Diamonds |
| Place Of Origin | Zhengzhou, China |
| Delivery Time | 1 - 15 Working Days Base on Order Quantity |
| Payment Terms | 100% Payment In Advance |
| Payment Methods | T/T, PayPal, Western Union, Bank Transfer |
| Shipping way | DHL, FedEx, SF Express, UPS, EMS, TNT etc |
| M.O.Q | Negotiable |
| Diamond Type | Synthetic(lab created) |
| Location | Zhengzhou, China |
| Treatments Applied | None |
| Fire Dispersion | 0.044(Same as Natural Diamond) |
| Brilliance Refraction Index | 2.42(Same as Natural Diamond) |
| Relative Density | 3.52(Same as Natural Diamond) |
| Chemical Composition | Carbon(Same as Natural Diamond) |
| Moh's Hardness | 10(Same as Natural Diamond) |
CVD Lab Grown Diamonds Introduction
Natural diamonds are created by nature and are the result of high
temperature and pressure formed over billions of years. The Rough
Lab Grown Diamonds are produced in the laboratory, usually in a few
weeks. The chemical difference between the two is same.
So how do you distinguish between Rough Lab Grown Diamonds and
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.
| The Difference Between Lab Diamond And Natural Diamond |
| Properties | Earth Mined | Lab Created |
| Guaranteed Conflict-Free | No | Yes |
| Hardness (MOHS) | 10 | 10 |
| SP3 Carbon Diamond Bonds (%) | 100% | 100% |
| Internal Crystal Structure | Face-Centered Cubic | Face-Centered Cubic |
| Hardness Comparable | 2.42 | 2.42 |
| Relative Diversity | 3.52 | 3.52 |
| Color Diffusion | 0.044 | 0.044 |
| Color | Various Grades | K to D grades |
| Price | $$$$$ | $$$ |
CVD Lab Grown Diamonds Details
