18K Gold contains 18 parts pure gold out of 24, or 75% gold by weight; the rest is alloy metals such as silver, copper or zinc that make it harder and change its color.
The karat system divides gold into 24 parts. 18K Gold is usually stamped 750, the purity in parts per thousand, which is the mark buyers and assay offices check.
Measurement system: Jewelry purity grading based on 24-part karat reference. SI equivalent: Reference purity factor used in the converter: 0.75.
18K Gold facts
- Unit name
- 18K Gold
- Symbol
- 18K
- Category
- Gold Karat
- Measurement system
- Jewelry purity grading based on 24-part karat reference
- SI equivalent
- Reference purity factor used in the converter: 0.75
- Common uses
- Jewelry, valuation, alloy comparison and gold-purity checks
Definition of the 18k gold
18K Gold contains 18 parts pure gold out of 24, or 75% gold by weight; the rest is alloy metals such as silver, copper or zinc that make it harder and change its color.
Measurement system and SI relationship
Jewelry purity grading based on 24-part karat reference
SI equivalent: Reference purity factor used in the converter: 0.75
History of the 18k gold
The karat system divides gold into 24 parts. 18K Gold is usually stamped 750, the purity in parts per thousand, which is the mark buyers and assay offices check.
Where is the 18k gold used?
Jewelry, valuation, alloy comparison and gold-purity checks