wholesale bridal jewelry and accessories What is the weight grading standard of diamonds?

wholesale blank pendants for jewelry making Clarks, or translation cards, carat, is the quality unit of diamonds. One carat is equivalent to 200 mg. According to legend, early diamond merchants call the diamonds used to measure the fruits of rice bean trees (carob), and such fruits are about 200 mg of about 200 mg.
Because the density of the diamond is basically the same, the heavier the diamond volume. The bigger the diamond, the higher the value of each carat. The following table is the price comparison in 2005.

It classification standards
classification (Clarity)
The clarity determines how much the inner contents in the diamond. Inner content may be natural impurities or cracks. The quantity, location, size, etc. of the inner content will affect the rating. Only 20%of diamond mines can become gems, and the rest are usually used in industrial use.
and 20%~ 40%of gem -level diamonds contain the internal contents visible to the naked eye. Diamonds above this level are more popular. As for the perfect level of diamonds, it is even more rare, and it is called the "museum -level" diamond. Generally, the size, quantity, distribution, and extent of the contents of the internal and surface contents of diamonds are used to observe the diamonds.

color (color)
The color of the diamond will be deviated by chemical impurities. The completely pure diamond should be transparent. Diamond bias towards different colors will affect its value. Most diamonds are yellowish because of nitrogen atoms. The yellower the white diamond, the lower the value. But the price of pink or blue diamonds is higher. The color that is strongly biased towards pink or blue may be valuable.
The general method is to divide the diamond according to the degree of yellowing into different levels, and compare the sample to the known color grade comparison of color stones.

In considering the color of diamonds, the fluorescent response should also be considered. The fluorescent response refers to the reaction color light that occurs when the diamond is exposed to ultraviolet light.
but the fluorescent response rarely affects the value of the diamond. Unless diamonds with very strong fluorescent light will affect its transparency and glory, and the oily appearance will be produced. This will reduce the beauty and value of the diamond. However, if its fluorescence does not cause the diamond to produce an oily appearance, it should not be regarded as a disadvantage.
This response is divided into 1. None 2. Faint 3. Medium 4. Strong 5. Very Strong level 5.
The expansion information:
. Industrial use

because of the high hardness of diamond and high thermal conductivity, it can be used for sand paper, drilling and grinding tools, which can be used for it. Cut and portray other substances, as well as large integrated circuits and other heat sinks.
, after GE obtained the artificial diamond technology through high temperature and high pressure in 1955, scientists will use high temperature and high pressure to be used to be used to form diamond particles, and the synthetic diamonds of small particles are now cheaper than natural diamonds, so natural diamonds Industrial value has completely disappeared; the main use of natural diamonds is limited to jewelry and viewing.

. The use of ornamental use
Due to the high refractive index, diamonds appear shining under the light, called diamonds. Giant beauty diamonds are often valuable. When diamonds have blue, green, or pink, it is very rare, while the color is dark and bright. At present, the most expensive color diamonds must be a strong red diamond.
The diamonds are divided into two types: first and second type, which is mainly based on whether it contains n elements: first type; type 2 does not contain. The blue diamond is Type 2 and semiconductor.

. Production
diamonds of about 130 million carats (26,000 kg) each year are mining, with a total value of nearly USD 9 billion. 100,000 kilograms of diamonds are synthesized every year.
about 49%of diamonds comes from central and southern Africa. They are mined from the volcanic pipelines composed of Kinbarie and Potassium Magnesium. The high temperature and high pressure deep in the earth form diamonds, and these pipes can bring diamonds from ground to the surface.
The diamond supply chain is only controlled by some large companies, and is highly concentrated in a few regions in the world. In September 2012, Russia announced that the wavekidine pond in its territory found that the diamond mines exceeding the total global reserves were found.
Reference materials: Baidu Encyclopedia-King Kong Stone