Contrary to popular belief, when you buy a piece of gold jewelry, it usually isn’t made out of pure gold. แทน, almost all gold jewelry is made from an alloy created by combining pure gold with a variety of other metals.
The reason for this is that pure gold is very soft. If engagement rings, earrings and other jewelry were made using pure gold, they’d scratch, scuff, dent and warp extremely easy, often just from brushing against another surface.
There’s also the color issue — instead of the warm gold color that most of us associate with gold jewelry, pure gold is actually closer to orange in color.
เพราะเหตุนี้, modern gold jewelry uses gold that’s mixed with other metals. The purity of this gold is measured using the karat system, which provides information on what percentage of any type of gold is made up of pure gold.
Gold karatage is expressed in parts out of 24. ตัวอย่างเช่น, pure gold is 24K, as all 24 ออกจาก 24 parts consist of pure gold.
18K gold consists of 18 parts pure gold mixed with 6 parts other metals. Depending on the color of the gold (ตัวอย่างเช่น, ทองคำขาว, yellow gold or rose gold), these metals could include nickel, เงิน, ทองแดง, zinc and palladium. Expressed as a percentage, 18K gold is 75% ทองคำบริสุทธิ์.
14K Gold, ในทางกลับกัน, ประกอบด้วย 14 parts pure gold mixed with 10 parts other metal, with the other metals varying based on the gold’s color. Expressed as a percentage, the pure gold in a piece of 14K gold jewelry accounts for 58.3% of the total metal.