how can one produce the synthetic one?
"Hgh-pressure high-temperature" (HPHT) processes and chemical vapor deposition (CVD)
Diamond
The majority of commercially available synthetic diamonds are yellow and are produced by so-called "high-pressure high-temperature" (HPHT) processes. The yellow color is caused by nitrogen impurities. Other colors may also be reproduced such as blue, green or pink, which are a result of the addition of boron or from irradiation after synthesis.
Another popular method of growing synthetic diamond is chemical vapor deposition (CVD). 
describe carbon in covalent bonds and the importance of it It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds what are the characteristics of this element? Carbon is the sixth element, with a ground-state electron configuration of 1s2s2p, of which the four outer electrons are valence electrons. Its first four ionisation energies, 1086.5, 2352.6, 4620.5 and 6222.7 kJ/mol, are much higher than those of the heavier group-14 elements. where this element can be found in the earth? Earth's crust what are its most common allotropes? Amorphous carbon, graphite, and diamond how did this element get its name? The English name "carbon" comes from the Latin "carbo" for coal and charcoal, whence also comes the French "charbon", meaning charcoal. what is the last allotrope? Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. what can you tell about its electrical conductivity properties? Blue diamonds are natural semiconductors, in contrast to most diamonds, which are excellent electrical insulators. what are its surface properties? Diamonds are naturally lipophilic and hydrophobic, which means the diamonds' surface cannot be wet by water, but can be easily wet and stuck by oil. how this element can be identify? Optical techniques can distinguish between natural diamonds and synthetic diamonds. They can also identify the vast majority of treated natural diamonds.
wiki:1568261
Diamond [SEP] Synthetics
This method is mostly used for coatings, but can also produce single crystals several millimeters in size (see picture). As of 2010, nearly all 5,000 million carats (1,000tonnes) of synthetic diamonds produced per year are for industrial use. Around 50% of the 133 million carats of natural diamonds mined per year end up in industrial use. Mining companies' expenses average 40 to 60 US dollars per carat for natural colorless diamonds, while synthetic manufacturers' expenses average for synthetic, gem-quality colorless diamonds. However, a purchaser is more likely to encounter a synthetic when looking for a fancy-colored diamond because nearly all synthetic diamonds are fancy-colored, while only 0.01% of natural diamonds are.