Rectangular Shape 8mm - 10mm DEF Color Raw HPHT Lab Rough Dimonds
For HPHT Diamond Jewelry
HPHT Lab Grown Diamonds Description
High temperature and high pressure (HPHT) and chemical vapor
deposition (CVD) are the two most commonly used growth methods in
lab grown diamonds industrial.
Specifically, the lab grown 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 grow up just like the seed. Therefore, this method is also
called seed temperature gradient method.
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.
Generally, after more than ten hours, the growth of lab grown
diamonds is completed. However, at this time, the lab grown
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).
Parameters of HPHT Lab Grown Diamonds
| HPHT Rough Diamonds Details |
| Brand Name | Yuda Crystal |
| Name | HPHT Rough Diamonds |
| Diamond Color | D-F |
| Diamond Clarity | VVS-VS |
| Diamond Carat Weight | 7.0-12.0carat |
| 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 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 | $$$$$ | $$$ |
HPHT Lab Grown Diamonds Details
