4.0-5.0ct Synthetic White HPHT Rough Diamonds With VVS VS Clarity
and D-F Color
Synthetic White HPHT Rough Diamonds Description
How does high temperature and high pressure (HPHT) grow Synthetic
White HPHT Rough Diamonds?
HPHT is called high pressure high temperature. First of all, the
term HPHT includes two concepts: HPHT lab grown diamond and HPHT
treated processed. For example, brown diamonds can be turned yellow
or colorless by HPHT treatment.
High temperature and high pressure (HPHT) and chemical vapor
deposition (CVD) are the two most commonly used growth methods in
Synthetic White HPHT Rough Diamonds industrial.
Specifically, the Synthetic White HPHT Rough Diamonds growth
process is to put high-purity graphite as carbon source in the high
temperature area of the growth chamber of the top press, and place
natural or cultivated diamond seeds in the low temperature area.
Driven by a certain temperature gradient, carbon will diffuse from
the high concentration area at high temperature to the low
concentration area at low temperature, and crystallize at low
temperature when the seed crystal is supersaturated. Through the
seed crystal, it will 'germinate and grow up' just like the seed.
Therefore, this method is also called seed temperature gradient
method.
High temperature and high pressure (the pressure is generally
10-20Gpa, Generally, graphite can be directly transformed into
diamond at 1400-1700℃. However, due to the high temperature and
pressure required in the growth process, the technology is very
difficult. At present, metal catalysts (such as Fe, Ni, Mn, CO and
their alloys) are added in the industrial growth process as
catalysts (or fluxes) to reduce the growth temperature and
pressure, Improve the reaction conditions and speed up the reaction
rate (usually the pressure is 5-6Gpa and the temperature is
1300-1600℃).
Generally, after more than ten hours, the growth of Synthetic HPHT
Rough Diamonds is completed. However, at this time, the Synthetic
White HPHT Rough Diamonds surface will be coated with carbon and
metal catalyst, and these impurities need to be removed by pickling
solution (made of 90% concentrated sulfuric acid and 10%
concentrated nitric acid). After the impurities are removed by acid
pickling, the unique "growth trace" of Synthetic White HPHT Rough
Diamonds will be left on the surface of original diamond.
Parameters of Synthetic White HPHT Rough Diamonds
| Synthetic White HPHT Rough Diamonds Details |
| Brand Name | Yuda Crystal |
| Name | Synthetic White HPHT Rough Diamonds |
| Diamond Color | D-E-F |
| Diamond Clarity | VVS-VS |
| Diamond Carat Weight | 4.0 - 5.0 carat |
| Diamond Cut | Uncut |
| Technology | HPHT |
| Size | 5.0-15.0mm |
| Shape | Raw |
| Application | For Cutting Lab Grown Loose Diamonds |
| Place Of Origin | Zhengzhou, China |
| Delivery Time | 1 - 7 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) |
Synthetic White 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 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 | $$$$$ | $$$ |
Synthetic White HPHT Rough Diamonds Details
