International Gold Number Color
The International Gold Number Color (IGNC) system is a standardized color-coding system used to identify the purity of gold. It was developed and adopted by the International Organization for Standardization (ISO) in 1972. The IGNC system assigns a three-digit number to each gold alloy, with the number representing the percentage of pure gold in the alloy.
IGCN Color Chart
| IGNC Number | Gold Purity | Color |
|—|—|—|
| 999 | 24 Karat | Pure gold |
| 950 | 22 Karat | Yellowish gold |
| 916 | 21 Karat | Slightly pale yellow |
| 833 | 18 Karat | Slightly pale yellow |
| 750 | 18 Karat | Pale yellow |
| 585 | 14 Karat | Greenish gold |
| 500 | 12 Karat | Greenish gold |
| 417 | 10 Karat | Pale green |
| 333 | 8 Karat | Greenish yellow |
| 250 | 6 Karat | Greenish yellow |
Use of IGNC
The IGNC system is widely used in the jewelry industry to indicate the purity of gold items. The IGNC number is typically stamped or engraved on the item, along with the karatage.
Advantages
* Standardized: The IGNC system provides a consistent and standardized way to identify gold purity.
* International: The IGNC system is accepted and recognized worldwide.
* Accurate: The three-digit number provides a precise indication of gold content.
Conclusion
The International Gold Number Color system is an important tool for identifying the purity of gold alloys. It is widely used in the jewelry industry to ensure the authenticity and value of gold items. By understanding the IGNC system, consumers can make informed decisions when purchasing gold jewelry.
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