jewelry_help_attr-name_metal_stamp
Most jewelry items made of precious metal are stamped with information about the purity level of the metal content. Generally the stamp is placed in an inconspicuous place on the item so it does not detract from the design. Stamps will usually be located on the inside of the band on a ring, on the post or basket setting on a pair of earrings, on the bail (the part that the chain slides through) on a pendant, and on the connecting ring or the clasp on a necklace or bracelet. All jewelry stamps adhere to strict guidelines set by the Federal Trade Commission.
The table below lists the most common precious metal stamps, their alternative stamps or hallmarks, their purity level, and alloys commonly used.
| Metal Stamps | ||
| Metal stamp | Minimum percentage of pure metal | Common alloys** |
| .925 Sterling Silver Also: 925 Sterling, Sterling Silver* |
92.5% pure fine silver | Usually copper |
|
10k |
41.6% pure gold (10 parts out of 24) | Usually silver, copper, zinc, and nickel |
|
14k |
58.3% pure gold (14 parts out of 24) | Usually silver, copper, zinc, and nickel |
|
18k |
75% pure gold (18 parts out of 24) | Usually silver, copper, nickel, and palladium (for white gold) |
|
22k |
91.6% pure gold (22 parts out of 24) | Usually silver and copper |
|
24k |
100% pure gold (24 parts out of 24) | None |
|
900 Platinum |
90% pure platinum (900 parts out of 1,000) | Ruthenium, rhodium, palladium, and other platinum group metals |
|
950 Platinum |
95% pure platinum (950 parts out of 1,000) | Ruthenium, rhodium, palladium, and other platinum group metals |
|
*Alternate stamp or European hallmark Additional Information
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