*One carat is equal to 0.2grams.
*The waist diameter of the diamond will be affected by the cutting method and proportion. So the same weight diamonds may have different waistlines.
In the 1990s, chemical vapor deposition (CVD) was used to synthesize diamond films, which were deposited on solid-phase substrates to form polycrystalline films of diamond for industrial use.
However, it was not until 1970 that gem-quality diamonds with large grains were synthesized by the American company General Electric. After nearly thirty years of effort, it is now possible to obtain crystals as large as a dozen carats, but the cost of gem-quality diamond synthesis is still too high to allow for mass production.
only 3,500ct of synthetic diamonds could be cut and ground in 2000, representing only 0.01% of natural gem-quality diamond production that year.