Square Shape DEF Color VS VVS Clarity 9.0 - 10.0 Carat HPHT Rough
Diamonds For Big Size HPHT Diamond Jewlery Making
HPHT Rough Diamonds Description
Lab grown diamonds also called lab-created diamonds, synthetic
diamonds, man made diamonds. HPHT and CVD are two main methods to
create lab grown diamonds.
High temperature and high pressure method is also called seed
catalyst method. Graphite is a low pressure stable phase, and
diamond is a high pressure stable phase. The transformation from
graphite to diamond requires very high pressure and temperature
conditions, which generally requires a pressure and temperature of
10 GPa and above 3000 ℃. If there are metal catalysts (such as Fe,
Ni, Mn, Co and their alloys), the temperature and pressure
conditions required for graphite to become diamond will be greatly
reduced. Therefore, metal catalysts are involved in the synthesis
of diamond by high temperature and high pressure method at present.
As a solvent, the metal catalyst is between the carbon source
(usually graphite) and the diamond seed. The carbon source is at
the high temperature end and the seed crystal is at the low
temperature end. Because the solubility of the carbon source at the
high temperature end is greater than that at the low temperature
end, the solubility difference caused by the temperature difference
becomes the driving force for the diffusion of the carbon source
from the high temperature end to the low temperature end. The
carbon source gradually precipitates at the seed crystal and the
diamond crystal grows up gradually. Because the driving force of
crystal growth is caused by temperature difference, this method is
also called temperature difference method.
HTHP synthetic diamond is usually cube, octahedron and the
aggregation of the two. Synthetic diamonds usually have no
fluorescence under long wavelength ultraviolet, but yellow, green
yellow and orange yellow fluorescence under short wavelength.
Parameters of HPHT Rough Diamonds
| HPHT Rough Diamonds Details |
| Brand Name | Yuda Crystal |
| Name | HPHT Rough Diamonds |
| Diamond Color | DEF |
| Diamond Clarity | VS+ |
| Diamond Carat Weight | 9.0-10.0carat |
| Diamond Cut | Uncut |
| Technology | HPHT |
| Size | Customization |
| 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
