Gold stamps, also known as hallmarks, are markings applied to gold items to indicate their purity or fineness. These stamps signify the proportion of pure gold present in the metal alloy, which is essential for determining its value and quality.
These numerical markings represent the millesimal fineness of the gold, indicating the parts per thousand of pure gold. For example, a stamp of '750' means the item is 750 parts out of 1000 pure gold, with the remaining parts being other metals like copper, silver, or zinc.
Here are common gold stamps and their corresponding carat values, as indicated in the reference:
- 999: Represents 24 carat gold, which is considered pure gold (99.9% pure).
- 916: Represents 22 carat gold (91.6% pure).
- 750: Represents 18 carat gold (75% pure).
- 583: Represents 14 carat gold (58.3% pure).
- 375: Represents 9 carat gold (37.5% pure).
Understanding Gold Purity Stamps
Knowing the gold stamp helps consumers and jewelers quickly identify the gold content of an item without needing to perform an assay test. Higher numbers correspond to a higher percentage of pure gold and therefore a higher carat value.
| Gold Stamp | Carat Value | Purity (%) | Common Use |
|---|---|---|---|
| 999 | 24 Carat | 99.9% | Bullion, Investment |
| 916 | 22 Carat | 91.6% | Jewelry (in some regions) |
| 750 | 18 Carat | 75% | Fine Jewelry |
| 583 | 14 Carat | 58.3% | Durable Jewelry |
| 375 | 9 Carat | 37.5% | Everyday Jewelry |
These stamps are usually small and located on inconspicuous parts of the item, such as the inside of a ring band, on a clasp, or on the back of a pendant. In addition to the fineness mark, gold items may also carry other hallmarks indicating the manufacturer, the assay office, or the year of manufacture.
