Gross Weight
Also: Total Weight, Bruttogewicht, Gross Weight
The gross weight is the total weight of a precious metal item including all alloying components, before deducting impurities or additives.
The gross weight refers to the complete physical weight of a precious metal item — that is, the weight shown on a scale, without any deduction for alloying components, impurities, or foreign material. It stands in direct contrast to the fine weight, which describes only the actual precious metal content. Anyone wishing to determine the value of gold jewellery, coins, or scrap silver must understand this distinction.
The Relationship Between Gross Weight and Fine Weight
The relationship between gross weight and fine weight can be described with a simple formula:
Fine weight = gross weight × fineness (as a decimal)
The fineness indicates what proportion of the gross weight consists of pure precious metal. In a gold alloy stamped 585 (14 carat), 58.5% of the gross weight is pure gold; the remaining 41.5% consists of alloying metals such as silver, copper, or zinc.
| Alloy | Stamp | Fineness | Fine weight at 10 g gross weight |
|---|---|---|---|
| 8-carat gold | 333 | 33.3% | 3.33 g |
| 14-carat gold | 585 | 58.5% | 5.85 g |
| 18-carat gold | 750 | 75.0% | 7.50 g |
| 22-carat gold | 916.7 | 91.67% | 9.17 g |
| Fine gold | 999 | 99.9% | 9.99 g |
| Sterling silver | 925 | 92.5% | 9.25 g |
| Cutlery silver | 800 | 80.0% | 8.00 g |
Practical Significance for Purchasing and Melt Value
Dealers, refineries, and pawnbrokers always quote prices on the basis of the fine weight, not the gross weight. Anyone selling scrap gold or silver jewellery therefore receives only the value of the precious metal actually contained. Using the melt value calculator, the material-based amount can be calculated directly from the gross weight and stamp — the dealer's purchase price is usually below this, as processing costs and margin are deducted.
Key steps in determining value:
- Determine the gross weight on a calibrated precision scale (accuracy ≥ 0.01 g).
- Read the stamp or hallmark and establish the fineness.
- Calculate the fine weight: gross weight × fineness.
- Multiply the fine weight by the current gold price or silver price.
Gross Weight for Coins and Bars
For certified bullion coins and LBMA Good Delivery bars, gross weight and fine weight are precisely defined and stated on the product. A Krugerrand of one troy ounce, for example, contains exactly 31.1035 g of fine gold (one troy ounce), but as a coin it weighs around 33.93 g — the additional weight coming from the copper content (fineness 916.7/1000; 22 carat). The gross weight here is therefore measurably greater than the fine weight.
For fine bars (999.9), by contrast, gross weight and fine weight are almost identical; the minimal difference lies within the manufacturers' permitted tolerances.
Distinction from Related Terms
- Fine weight: the calculated precious metal content within the gross weight.
- Total weight (in a trade context): may additionally include packaging or a container — do not equate this with gross weight, even though both terms are used interchangeably in everyday language.
- Troy weight: the weight system used internationally in the precious metals trade; one troy ounce equals 31.1035 g.
In Brief
The gross weight is the starting value of any precious metal valuation — only by multiplying it by the fineness does the value-relevant fine weight emerge. Anyone buying or selling jewellery, coins, or bars should always keep the two figures clearly separate and always relate the current metal price to the fine weight.