HPHT (High Pressure High Temperature)
A HPHT diamond (High Pressure High Temperature) is a Lab Grown Diamond, a real diamond made of crystallized carbon. It is chemically, physically and optically identical to mine diamonds. At Green World Diamonds you get certificates from renowned gemmological laboratories like IGI, GCAL, GIA etc.
There are white and colored HPHT diamonds (White and Fancy Color Diamonds).
In HPHT synthesis, a press applies extremely high pressures and temperatures to a central growth chamber containing the necessary ingredients. This results in lab diamond crystals with combinations of cubic and octahedral faces. Similar to a honeycomb structure with squares.
✓ Analogous conditions deep earth interior
✓ Approx. 1’500° Celsius (extremely high temperature)
✓ 400 tons per square inch (extremely high pressure)
A “Lab Diamond” is a man-made diamond that has been grown in a laboratory environment by one of the two currently available manufacturing processes: HPHT (High Pressure High Temperature) and CVD (Chemical Vapor Deposition). All real diamonds consist of pure crystallized carbon (pure carbon); this applies to both mine diamonds and lab diamonds. The growing process mimics/imitates natural growth in the deep interior of the Earth (HPHT) or in interstellar gas clouds (CVD). Although the growth process is different from what occurs in nature, the chemical composition, physical properties, and optical characteristics of lab-grown diamonds are identical to those of diamonds mined/extracted from mines. Lab-grown diamonds come in all sizes (currently up to over 10 carats), all shapes and all colors, and the light output is identical to that of mined diamonds.
Also called: Lab diamonds, lab grown diamonds, laboratory-created diamond, lab diamond, man-made diamond, green diamond, green diamonds.
More about the HPHT Growing process and procedures of HPHT Lab Grown diamonds can be found here.