Chemical composition;

Formation principle;

Distribution of origin: world diamond resources and origin;

Diamond producing countries;

The country that produces the best diamonds;

Changes in the origin of diamonds;

The first diamond mine in the world;

Diamond mines in South Africa;

The largest single diamond producing area;

China diamond resources and producing areas;

Evaluate and select colors;

Clarity;

Carat); Weight;

Cut;

Identification hardness test;

Thermal conductivity test;

Observe the reflected light;

Look at the growing point;

Similar chemical composition test;

Imitation of artificial zirconia;

Evaluation agency;

IGI certification;

GIA certification;

HRD certification.

diamond

1. The name of this mineral is "Diamond", and its English name is Diamond. It comes from agonist in ancient Greece, which means hard and inviolable substance and is recognized as the king of gems. The chemical composition of diamonds is 99.98% carbon. In other words, diamond is actually a kind of carbon crystal with quite high density. 2. Mohs hardness of diamond: 10, which is the highest among natural minerals. Its brittleness is also quite high, and it will still break when it is hit hard. 3. Diamond cutting is the process of cutting diamonds into different shapes according to the shape of their original stones. Among them, eight popular shapes are round, oval, olive pointed, heart-shaped, pear-shaped, square, triangle and emerald. A round drill is the most common shape. 4. Diamonds are natural minerals. The main producing areas of diamonds are Australia, Botswana, Canada, Zimbabwe, Namibia, South Africa, Brazil and Siberia. At present, the main diamond cutting and grinding centers in the world are Antwerp, Tel Aviv, new york, Mumbai, Thailand and Bangkok. Antwerp has the reputation of "the diamond capital of the world", where about half of the world's diamond transactions are completed. "Antwerp Cutting" is synonymous with perfect cut. Diamonds (19) 5. Re-inspection is required to buy diamonds (the certificates of IGI and GIA can be verified directly in official website, and re-inspection is not required) 6. Refractive index: 2.4 17 7. Deviation value: 0.044 (high) 8. Total internal reflection: critical angle: 24.5.

Edit the mass unit of this paragraph.

Card, or translated as carat, carat, is the quality unit of diamond. One card is 200mg. According to legend, in the early days, the diamond was weighed by the fruit of carob tree, and one such fruit weighed about 200mg. Because the density of diamonds is basically the same, the heavier the diamond, the bigger the volume. The bigger the diamond, the rarer it is, and the higher the value of each card.

Edit the chemical composition of this paragraph.

The chemical composition of diamond is carbon, which is the only single element in gem and belongs to equiaxed crystal system. It often contains 0.05%-0.2% impurity elements, of which N and B are the most important, and their existence is related to the types and properties of diamonds. The crystal forms are mostly octahedron, rhombic dodecahedron, tetrahedron and their aggregates. Pure diamond is colorless and transparent, showing different colors due to the mixing of trace elements. Strong diamond luster. The refractive index is 2.4 17 and the dispersion is moderate, which is 0.044. An isotropic object. The thermal conductivity is 0.35 calories/cm/sec/degree. Tested by thermal conductivity meter, the response is the most sensitive. The hardness is 10, which is the hardest mineral known at present. The absolute hardness is 1000 times that of the time, and 150 times that of corundum. It is afraid of heavy blows, and it will be broken by cleavage after heavy blows. A set of cleavage is completed. The density is 3.52g/cm3. 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 difference between diamonds and similar precious stones and synthetic diamonds. Common substitutes or counterfeits in gem market include colorless gemstones, colorless spinel, cubic zirconia, strontium titanate, yttrium aluminum garnet, yttrium gallium garnet, artificial rutile and so on. Synthetic diamonds were first developed by Japan in 1955, but they were not mass-produced. Synthetic diamonds are rare in the market because they are more expensive than natural diamonds. Diamonds can be distinguished from similar gems by their unique hardness, density, dispersion and refractive index. For example, diamond-like cubic zirconia is colorless, with strong dispersibility (0.060), strong luster and high density of 5.8 g/cm3, which has obvious sense of gravity. Yttrium aluminum garnet has a soft dispersity, so it is difficult to distinguish it from diamonds with naked eyes. It has become a popular gem that people can own and wear. Diamond culture has a long history, and today people regard it more as a symbol of love and loyalty.