Use "k gold" to indicate the purity of gold
The "K gold" means that the yellow pure gold jewelry is usually divided into full gold and K gold.
In theory, we refer to 100% gold as 24K (24K gold is often considered pure gold, the composition is 100%, but the actual content is 99.99%, which is 23.988K); the calculation method is 100/24.
National standard: National standard GB11887-89 stipulates that every K (English carat, German karat abbreviation, often written "K") gold content is 4.166666%, China's K gold in the early days of New China is 4.15% per K pure gold The standard calculations, after 1982, have been unified with international standards, with a gold content of 4.166% per K.
Method for calculating K gold color
Color = K to X4.166%
8K=8X4.166%=33.328%
(The gold content is 33.3%, and the national standard is 333‰)
9K=9X4.166%=37.494%
(The gold content is 37.5%, and the national standard is 375‰)
10K=10X4.166%=41.660%
(The gold content is 41.7%, and the national standard is 417‰)
12K=12X4.166%=49.992%
(The gold content is 50%, and the national standard is 500‰)
14K=14X4.166%=58.324%
(The gold content is 58.3%, and the national standard is 583‰)
18K=18X4.166%=74.998%
(The gold content is 75%, and the national standard is 750‰)
20K=20X4.166%=83.320%
(The gold content is 83.3%, and the national standard is 833‰)
21K=21X4.166%=87.486%
(The gold content is 87.5%, and the national standard is 875‰)
22K=22X4.166%=91.652%
(The gold content is 91.6%, and the national standard is 916‰)
24K=24X4.166%=99.984%
(The gold content is 99.9%, and the national standard is 999‰)
In theory, 100% of the 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 99.6% or more (including 99.6%) can be called 24K gold, and the national regulations are low. 9K gold jewelry can not be called gold jewelry.
Express the purity of gold in words
Some gold jewellery is marked with a text mark. The stipulation is that the gold content of the gold is not less than 990 ‰, and the gold content of the 999 gold is more than 999 ‰.
China has regulations on gold product imprints and signage. Generally, it requires production company code, material name, content mark, etc., and no mark is unqualified. The same is true internationally. However, for some particularly small products, it is also allowed to mark.
Express gold purity with Arabic numerals
For example, 99 gold means "full gold" and 9 gold means "thousands of gold."
However, from May 4 this year, the title of the thousand-foot gold that has been used for 14 years will be canceled, and the gold jewelry will be unified in the form of full gold, and the nominal content.
Use gold to indicate gold purity
For example, it is labeled 18/24, that is, the color is 18K (750 ‰); it is labeled 22/24, that is, the color is 22K (916 ‰).
Gold calculation method
1 carat = 0.2 g
1 troy ounce = 31.1035 grams
1 Hong Kong two = 37.429 grams
1 inch = 25.4 mm 1 carat = 100 points
1 troy ounce = 480.0000 gel
1 money = 3.743 g
1 inch = 2.54 cm
1 gram = 5 carats
1 drag = 0.375 troy ounces
(Mainland) 1 two = 31.25 grams
1 mm=0.03937 inches
1 gram = 20 gram
1 constant ounce = 28.3495 grams
1 money = 3.125 g
1 cm = 0.3937 inches
1 Zhuke = 0.25 carat
1 constant ounces = 0.911458 troy ounces
1 silver dollar = 23.4375 grams
1 Zhuke = 0.05 g
24K=100% gold
22K=91.67% gold
20K=83.33% gold
18K=75% gold
14K=58.5% gold
12K=50% gold
10K=42% gold
9K=37.5% gold
8k=33.5% gold
kaiyue , https://www.marketuniongroups.com