When we buy jewelry, we often see a lot of jewelry engraved with letters and numbers. We are curious about what they mean. To make you not suffer a loss when buying, next, we will introduce you to several standard jewelry numbers and letters that represent the meaning. Hope to help you.
1.Gold jewelry
（1）Pure gold
“G 990” and “AU 990” are imprinted. It refers to gold jewelry that contains at least 990 percent of gold per thousand percentage points.
（2）K gold
K is an international unit, and the gold content is 24k when the thousand fraction is 1000. The gold content of 1K gold is about 41.66‰. Common k gold such as 22K (916‰), 18K (750‰), 14K (585‰), 9K (375‰). The marks are “Auxxx”, “Gxxx”, “GxxK”. We often say that “color gold” also belongs to K gold, the color formed by melting other metal elements in the gold matrix. The three standard colors of k gold are yellow K gold, white K gold, and red K gold. For example, the gold content of 18K gold is 750‰. The imprint is “Au750“, “G18K“,”G750“,”18K“. The gold content of 14K gold is 585‰, and the pattern is “Au585“, “G14K“,”G585“,”14K“.
24k gold markings:”Au999″,”G999″,”G24K”,”24K”.
22k gold markings:”Au916″,”G916″,”G22K”,”22K”.
20k gold markings:”Au833″,”G833″,”G20K”,”20K”.
18k gold markings:”Au750″,”G750″,”G18K”,”18K”.
14k gold markings:”Au585″,”G585″,”G14K”,”14K”.
12k gold markings:”Au500″,”G500″,”G12K”,”12K”.
10k gold markings:”Au417″,”G417″,”G10K”,”10K”.
9k gold markings:”Au375″,”G375″,”G9K”,”9K”.
| K(Karat) | Purity |
| 24K | 99.95% |
| 22K | 91.6% |
| 20K | 83.3% |
| 18K | 75% |
| 14K | 58.5% |
| 12K | 50% |
| 10K | 41.7% |
| 9K | 37.5% |
（3）Mosaic gold
Gold is a kind of K gold in gold with various other metals such as aluminum, silver, cadmium, palladium, etc. The jewelry appears purple, pink, blue, green, gray, and different colors. So its imprint is also consistent with the karat gold imprint.
2.Platinum jewelry
（1）Pure platinum
Imprinting is “PT 990” marking. It refers to gold jewelry that contains at least 990 platinum per thousand cents.
（2）950 platinum
Imprinting is marked “PT 950“. Gold jewelry that contains at least 950 platinum per thousand cents.
（3）900 platinum
Imprinting is “PT 900” marking. Gold jewelry that contains at least 900 platinum per thousand cents.
（4）850 platinum
Imprinting is “PT 850” marking. Gold jewelry that contains at least 850 platinum per thousand parts per thousand.
3.Silver jewelry
（1）Sterling silver
The imprints are “Ag 990” and “S 990“. It refers to jewelry containing a silver millennial ratio of 990 or more.
（2）925 silver
The seals are “S 925” and “Ag925“. It refers to jewelry with a silver millennial ratio of no less than 925, the most common silver jewelry.
（3）800 silver
The seals are “S 800” and “Ag800“. It refers to jewelry with a silver millennial ratio of no less than 800, the most common silver jewelry.
（4）Silvering
Imprinting is “SL” marking. The silver foil is coated on the surface of zinc, copper, and other metal materials.
（5）Silver plated
It is used to plate a thin layer of silver on the surface of jewelry made of copper by the principle of electrolysis and is marked as”FS“.
4.Palladium jewelry
（1）Pure palladium
Imprinting is “PD 990” marking. It refers to gold jewelry that contains at least 990 palladium per thousand cents.
（2）950 plalladium
Imprinting is marked “PD 950“. Gold jewelry that contains at least 950 palladium per thousand cents.
（3）500 palladium
Imprinting is marked “PD 500“. Gold jewelry that contains at least 500 palladium per thousand cents.
5.Diamond
The diamond ring is marked with the size of the diamond starts with a“D,” and then you add some numbers. For example, D050 refers to a 50 cent (0.5CT) diamond. D050 D0025 refers to the main stone 0.50 carats, accessory stone 2.5 points (0.0025 carats). Still have direct write D0.50ct.
6.Gold plated and gold clad and forging gold
(1)Gold plated
It is used to plate a thin layer of gold on the surface of jewelry made of silver or copper by the principle of electrolysis. According to the industry standard in China, the thickness of gold plating is no less than 0.5um, and the gold-plated jewelry is marked as “GP” or “KP“or “P-Au“.
(2)Gold clad
The gold foil is coated on the surface of silver, copper, and other metal materials. It is required that the color of the gold foil is not less than 10K and the weight is not less than 1/20 of the total weight of the material, and it is marked as”KF“or “L-Au“.
(3)Forging gold
In essence, it belongs to gold, which is forged and pressed on the surface of other metal jewelry blank under high temperature and high pressure. The fineness requirement of gold leaf is greater than 10K, and the total amount of wrought gold is not less than 5% of the finished product, which is marked as “GF” or “KGF.”
7.Platinum rhodium
Marked with PtRh5, PtRhl0, PtRhl3, PtRh30 and PtRh40, and other alloys, currently few in jewelry.
In addition to the numerical symbols mentioned above, there are other symbols: company abbreviations, place of production, manufacturer, brand labels, etc. Some of which also indicate the cut, clarity, color grade, etc.
