Oval Brilliant Cut White Polish Diamond Certified Lab Grown
Diamonds
Lab Grown Diamonds Classification
There are two methods for mass production of diamonds in the
market: Chemical Vapor Deposition (CVD) and High Pressure High
Temperature and High Pressure (HPHT).
CVD chemical meteorological precipitation method
CVD uses one or more gases to chemically react on a heated solid
substrate and to coat it with a solid film. The so-called CVD
(Chemical Vapor Deposition) diamond is a natural diamond bare stone
as the mother stone, the use of high purity methane, plus hydrogen,
nitrogen and other gases assisted, in the microwave oven under high
pressure, so that methane and diamond like carbon molecules
continue to accumulate on the diamond stone, after layer by layer
of proliferation. It can form transparent diamonds up to 10 carats.
In order for CVD diamonds to grow smoothly, the carbon source is
usually methane with diamond structure. Methane can be thought of
as a one-atom diamond pressed out of hydrogen. This kind "grow up"
diamond, quality and natural diamond a few without 2 send, naked
eye discernible.
HPHT high temperature and high pressure method
HPHT has several different machines, all of which work on a similar
principle, creating a high temperature and pressure environment at
the center of the machine that crushes carbon powder into diamonds.
A metal catalyst is required in the middle, so many HPHT diamonds
contain metal impurities. Early can only produce yellow small
particles, as industrial abrasive use; With technological progress,
many domestic manufacturers can produce large colorless particles
with less metal content, reaching the grade of jewelry. Domestic
production capacity is mainly concentrated in the bare weight of 1
carat or less after cutting. Russia has a family once grew a cut
after 10 carat diamond, but this kind of large particles pick one
in ten thousand, not energy production at present.
Characteristics Of Lab Grown Diamonds
| The Difference Between Lab Diamond And Natural Diamond |
| Attribute | Lab Grown Diamonds | Natural diamond | Distinction |
| Chemical composition | C(carbon) | C(carbon) | No |
| Refractive index | 2.42 | 2.42 | No |
| Relative density | 3.52 | 3.52 | No |
| Dispersion | 0.044 | 0.044 | No |
| Hardness value | 90 GPA | 90 GPA | No |
| Thermal conductivity | 2*103 W/M/K | 2*103 W/M/K | No |
| Thermal property | 0.8*10-6 K | 0.8*10-6 K | No |
| Light transmittance | DEEP UV TO FAR TR | DEEP UV TO FAR TR | No |
Resistivity | 1016 OHM-CM | 1016 OHM-CM | No |
Compressibility | 8.3*10-13 M2/N | 8.3*10-13 M2/N | No |
From a scientific point of view, cultivated diamonds are exactly
the same as natural diamonds, the only difference being where they
are formed.
Prospects And Advantages Of Lab Grown Diamonds
As one of the emerging choices of global diamond consumption,
cultivating diamond has obvious competitive advantages in quality,
price, environmental protection and technology. With the continuous
improvement of diamond synthetic technology, the rapid decrease of
cost and price, and the change of market consumption concept and
habits, the market attention has been significantly increased, and
it has become one of the most important development directions of
artificial diamond industry. According to Bain, the global
production of cultured diamonds in 2020 will be around 7 million
carats, with a penetration rate of around 6.5% and a projected
growth rate of 15-20% in the future.
Lab Grown Diamonds Details
