CVD (Chemical Vapor Deposition)
A CVD diamond (Chemical Vapor Deposition) is a grown laboratory diamond (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 CVD diamonds (White and Fancy Color Diamonds).
In CVD synthesis, microwaves split the hydrocarbon molecules fed into the reactor. These fragments migrate downward to the colder diamond nucleus and attach to the growing diamond surface. The Lab diamond grows in thin layers, and its final thickness depends on the time available for growth. The result is flat, tabular crystals (similar to a cube) whose outer surface is coated with black graphite.
✓ Analogous conditions of interstellar gas clouds (how cool is that?)
✓ Vacuum chamber
✓ Approx. 1’000° Celsius (high temperature, lower than HPHT)
✓ Microwave beam
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 cut to 30 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 CVD Growing process and procedure of CVD Lab Grown diamonds can be found here.