"4C" is the yardstick for you to judge the value and quality of a diamond. The so-called "4C" is the abbreviation of four English words beginning with C, which refers to the carat weight, clarity, color and cut of diamonds.

You can easily understand the value and quality of a diamond just by appreciating the four points of "4C". Diamond price = weight+color+clarity+cut.

Extended data:

4C parameter

1, carat weight

The weight of diamonds is measured in carats (also called cards). 1 carat = 200mg = 0.2g A carat is divided into one hundred parts, and each part is called one point. 0.75 carat is also called 75 minutes, and 0.0 1 carat is 1 minute.

2. Clarity

The clarity of a diamond is usually classified by using a magnifying glass with a magnification of 10 to classify the internal and surface defects of the diamond and their influence on the luster. According to China's national inspection standards, it is divided into LC, VVS 1, VVS2, VS 1, VS2, SI 1, SI2, P 1 and P2.

3. Color (color)

Diamonds have many natural colors, from precious colorless (white after cutting), rare light blue and pink to common light yellow. The more transparent and colorless, the more white can penetrate, and the richer the color after refraction and dispersion.

4. Cut (cut)

Diamond cutting refers to the accuracy of its cutting and grinding ratio and the perfection after finishing. Good cutting should reflect the brightness and fire color of the diamond as much as possible, and try to keep the weight of the original stone.

Founder of diamond 4C standard:

GIA American Gemological Institute Robert M. Shipley, founder of American Gemological Institute, 193 1 founded GIA in Los Angeles, USA.

At first, evening classes and correspondence courses were used to train jewelers on how to evaluate wholesale prices. 1953, GIA established its first laboratory in new york and began to issue diamond appraisal reports. Later, two other laboratories were established in Santa Monica, California and downtown Los Angeles, officially named Gem Trade Laboratory. GTL GTL company belonging to GIA.

GIA is a non-profit organization established with the support of famous American jewelers and celebrities. GIA is an appraisal research institution owned by American jewelers, and its subsidiary GTL provides appraisal services.

GIA's Achievements Up to now, GIA has 14 teaching institutions around the world, providing professional courses in research, sales and appraisal, cultivating high-quality jewelry practitioners, and also contributing to GIA's high reputation in the industry.

References:

Baidu Encyclopedia-4c