International Gold Number Color
The International Gold Number (IGC) is a color-coding system used to classify the hue, saturation, and value of gold alloys used in jewelry. It was developed in the early 20th century by the International Organization for Standardization (ISO), and is used worldwide to ensure consistent and accurate identification of gold alloys.
The IGC system is based on three primary colors: red, yellow, and white. Each primary color is assigned a numerical value from 0 to 10, with 0 indicating the absence of that color and 10 indicating the maximum intensity of that color.
The hue, saturation, and value of a gold alloy are all represented by the IGC. The hue is the dominant color of the alloy, and is determined by the relative proportions of red, yellow, and white present. The saturation is the intensity of the hue, and is determined by the amount of gray present in the alloy. The value is the lightness or darkness of the alloy, and is determined by the amount of black present in the alloy.
The IGC system is widely used in the jewelry industry to ensure that customers are purchasing gold jewelry of the desired color and quality. It is also used by manufacturers and retailers to maintain consistency in the production and sale of gold jewelry.
The most common IGC numbers are:
* 4N: Yellow gold with a slightly reddish hue
* 5N: Yellow gold with a slightly greenish hue
* 6N: Yellow gold with a neutral hue
* 7N: Yellow gold with a slightly whitish hue
* 8N: Yellow gold with a strong whitish hue
* 9N: White gold with a slightly yellowish hue
* 10N: White gold with a neutral hue
* 11N: White gold with a slightly bluish hue
* 12N: White gold with a strong bluish hue
The IGC system is a valuable tool for the jewelry industry, ensuring that customers can purchase gold jewelry of the desired color and quality. It is also used by manufacturers and retailers to maintain consistency in the production and sale of gold jewelry.
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