The original diamond was discovered in India in 800 BC.

Diamonds are usually found in Africa.

1980 Found in South Africa, the original stone weighs 599 carats.

12 years, China also found extra-large rough diamonds.

Diamond (scientific name), also known as Jin Gangzuan, comes from the ancient Greek agonist, which means hard and inviolable substance. Diamond has a great hardness. The hardness here refers to Mohs hardness (non-impact resistance), and the hardness is 10. It is the hardest mineral known at present, and its absolute hardness is 1 0,000 times that of timely and10.50 times that of corundum. It is afraid of heavy blows, and the cleavage will break after heavy blows. Its density is 3.52g/cm3, and d = 3.2. Strong diamond luster. The refractive index is very high: 2.4 17, and the dispersion is moderate, being 0.044. An isotropic object. Melting point is higher than 3550℃, boiling point is 4827℃, and it is not conductive. The thermal conductivity is 0.35 calories/cm sec .. Tested by thermal conductivity meter, the response is the most sensitive. A set of cleavage is completed. Diamonds are luminous, and after being irradiated by sunlight, they can emit light blue phosphorescence at night. X-ray irradiation emits sky blue fluorescence. The chemical properties of diamond are very stable, and it is not easy to dissolve in acid and alkali at room temperature, and acid and alkali will not affect it. The natural sapphire "Star of Asia" shining with six starlight weighs 330 carats, which is produced in Myanmar and is a world-famous treasure. It is now in the Smithsonian Museum in Washington, USA.

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