Square Shape DEF Color 11mm - 13mm E F G H I Color Raw Uncut HPHT
Diamonds For Cutting And Polishing Loose Diamonds
Lab Created Diamonds Description
Cultivated diamond is synthesized by artificial simulation of
natural diamond crystallization conditions and growth environment,
and natural diamond has exactly the same physical, chemical and
optical properties. Production time is perhaps the biggest
difference between the two types of diamonds, with natural diamonds
taking hundreds of millions of years to form and cultured diamonds
taking just a few weeks to produce.
Scientists have mastered how to grow a diamond in a laboratory,
which is much cheaper than mining natural diamonds.
1. High pressure high Temperature method (HPHT)
Growing diamonds requires an indispensable element: carbon (C). In
the process of growing HPHT diamonds, pure carbon powder is
compressed into a growth capsule and then placed in a incubation
chamber at pressures of 5-6 gpa and extremely high temperatures (up
to 1300-1600°C) day in and day out. Eventually the carbon atoms
join together to form a diamond crystal. Many large diamonds over
10 carats can be produced in one go in less than two weeks.
2.Chemical vapor Deposition (CVD)
Breeding process of chemical vapor deposition method is as follows:
first, place a piece of diamond chips in a vacuum box, the next in
the chamber filled with a mixture of hydrogen and methane gas, the
gas provides a carbon atom, under the pressure of certain heating,
until the gasification of carbon atoms on the thin layers and
layers of sedimentary, like rain, forming uniform diamond coating.
It takes nearly a month to grow a one-carat CVD diamond crystal.
Parameters of HPHT Rough Diamonds
| CVD Rough Diamonds Details |
| Brand Name | Yuda Crystal |
| Name | HPHT Rough Diamonds |
| Diamond Color | DEF |
| Diamond Clarity | VVS-SI |
| Diamond Carat Weight | 8.0-10.0carat |
| Diamond Cut | Uncut |
| Technology | HPHT |
| Size | 5.0-7.0mm,11mm 13mm |
| Shape | Raw, Square |
| 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) |
HPHT Rough Diamonds Introduction
Natural diamonds are created by nature and are the result of high
temperature and pressure formed over billions of years. The 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 Lab Grown Diamonds and natural
diamonds?
There is no obvious difference between the 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 Rough Diamonds Details
