1.51 carat D Round BRILLIANT VS1 lab diamonds HPHT

1.51 carat D Round BRILLIANT VS1 lab diamonds HPHT

Natural & Synthetic,which one is environmentally kind!

  As we all know, the mining sites of natural diamonds are very difficult to select,and the mining project is enormous and environmentally destructive by using some large machinery.That results in some serious problems including blood diamonds,conflict diamonds,child labour, human rights violations,resource exhaustion and environmental crisis.  

  The synthesis of industrial-grade diamonds has been widely used and almost two-thirds of all industrial diamonds have now been replaced by synthetic diamonds. 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. 

  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. 2003 saw the synthesis of gem-quality single crystals by Apollo in the USA, and commercial production began. 

  More recently, the Geophysical Laboratory of the Carnegie Institution of Washington, USA achieved a CVD synthesis rate of 100μm/h to produce a 10ct, half-inch thick single-crystal diamond. To further increase the size of synthetic diamond crystals, it is possible to grow colorless diamond single crystals in three dimensions at the inch scale (approximately 300ct) by sequentially growing them on six faces of the diamond substrate using CVD. High-pressure, high-temperature heat treatment has also been found to improve the color and hardness of synthetic CVD diamonds.