Diamond is an elemental crystal composed of carbon, which is formed in the deep part of the earth at high pressure and high temperature. Diamond is the hardest natural substance known in the world at present. Diamonds are rare, usually colorless crystals, which have high refractive characteristics and can reflect colorful luster. Diamonds can be used not only as jewelry, but also as advanced cutting and grinding materials in industry.
Diamonds are the products of diamond processing. Diamonds are the hardest and simplest gems in the world. It is a cubic natural crystal composed of carbon. Its composition is basically the same as our common coal, pencil lead and sugar. Under high temperature and pressure, carbon element crystallizes to form graphite (black), while under high temperature, extremely high pressure and reducing environment (usually anoxic environment), it crystallizes to become precious diamond (colorless).
Distribution of origin
Diamonds are produced all over the world. More than 30 countries have diamond resources, with an annual output of about 1 100 million carats. The top five countries in output are Australia, Congo, Botswana, Russia and South Africa. The diamond production of these five countries accounts for about 90% of the world's diamond production.
Other diamond producing countries are Congo, Brazil, Guyana, Venezuela, Angola, Central Africa, Ghana, Guinea, C? te d 'Ivoire, Liberia, Namibia, Sierra Leone, Tanzania, Zimbabwe, Indonesia, India, China and Canada. The main diamond cutting centers in the world are Antwerp, Tel Aviv, new york, Mumbai and Bangkok.