Difference:
1, gold content
18k: 18k gold is an alloy with a gold content of at least 75%, that is, an alloy with a gold content of 18/24.
24K: China stipulates that only gold with a content above 99.6% can be called 24k gold. Also known as thousands of gold.
Step 2 write a composition
18k: 18k gold is an alloy with a gold content of at least 75%, and the remaining 25% is other precious metals, including platinum, nickel, silver and palladium. Among them, platinum is actually an alloy of gold with elements such as nickel, zinc and copper.
24K: In theory, 100% gold can be called 24K gold, but in reality it is impossible to have 100% gold, so China stipulates that gold with a content of over 99.6% (including 99.6%) can be called 24k gold.
Step 3 color
18k: Because it contains 25% other metals, 18K gold can also be made into different colors, such as white, yellow and rose red, which are respectively called: white 18K gold, 18K gold and 18K rose gold.
24k: shiny deep yellow, thick yellow. The higher the purity of gold jewelry, the darker the color.
4. Weight
24k: The specific gravity of gold is 19.32, which is heavier than silver, copper, lead, zinc, aluminum and other metals. Because the volume of gold is more than 40% heavier than that of silver, 1.2 times heavier than that of copper and 6. 1 times heavier than that of aluminum. Gold ornaments should feel heavy in your hand.
18k: 18k gold pendant, while the gold ornaments float lightly.
5. Difficulties
24k: Pure gold is soft and has low hardness. You can draw shallow marks with your nails and bite out teeth marks with your teeth.
18K: 18K gold ornaments not only have the precious value of gold, but also have the advantages of strong ductility, high hardness and various colors due to its perfect composition ratio. When used in jewelry design, it can give full play to the complex and exquisite creative expression.
Baidu encyclopedia-18K gold
Baidu encyclopedia -24K