Large Size Lab Created HPHT Rough White Diamond HPHT Synthetic Diamond For Jewery

HPHT Lab Grown Diamonds Description

HPHT synthetic diamonds usually contain metal co-solvent inclusions, which are black and opaque under transmitted light, and appear metallic under reflected light. This is because during the growth of HPHT diamonds, metals used as catalysts sometimes enter the diamond crystals. These co-solvent metal alloys contain elements such as iron, nickel, and cobalt. Therefore, sometimes a magnet can be used to attract synthetic diamonds with larger metal inclusions.
CVD-grown synthetic diamonds do not contain metal inclusions. But they usually contain dark graphite inclusions or other mineral inclusions, which are formed during their unique growth process. Graphite inclusions are different from metal inclusions in that they have no metallic luster.
The CVD process is very different from the formation of natural diamonds. In a vacuum chamber filled with a hot mixture of hydrocarbon gas (usually methane) and hydrogen, extremely low pressure is applied, and diamonds are produced. Under normal circumstances, heating the mixture at such low pressures will produce graphite or some other non-diamond form of carbon. But in the CVD growth chamber, some of the hydrogen is converted into hydrogen atoms, which promotes the formation of diamonds, because diamonds are more stable in this environment. The conversion of hydrogen molecules into hydrogen atoms is accomplished by the application of microwaves, electric discharges or hot wires.

Parameters Of Artificial Lab Created Diamonds

Artificial Lab Created Diamonds Details