Gross Weight
Also: Total Weight, Raw Weight, Gross Weight
Gross weight is the total weight of a precious metal object including all alloying components, before any deduction for impurities or additives.
Gross weight denotes the complete physical weight of a precious metal object — that is, the weight shown on a scale, without any deduction for alloying components, impurities, or foreign material. It stands in direct contrast to fine weight, which describes only the actual precious metal content. Anyone wishing to determine the value of gold jewellery, coins, or scrap silver must be familiar with this distinction.
Gross Weight and Fine Weight in Relation
The relationship between gross weight and fine weight can be expressed with a simple formula:
Fine Weight = Gross Weight × Fineness (as a decimal)
Fineness indicates what proportion of the gross weight consists of pure precious metal. In a gold alloy stamped 585 (14 karat), 58.5% of the gross weight is pure gold; the remaining 41.5% is made up of alloying metals such as silver, copper, or zinc.
| Alloy | Hallmark | Fineness | Fine Weight at 10 g Gross Weight |
|---|---|---|---|
| 8-Karat Gold | 333 | 33.3% | 3.33 g |
| 14-Karat Gold | 585 | 58.5% | 5.85 g |
| 18-Karat Gold | 750 | 75.0% | 7.50 g |
| 22-Karat 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 Importance for Buying and Melt Value
Dealers, refineries, and pawnbrokers quote prices exclusively on the basis of fine weight, not gross weight. Anyone selling scrap gold or silver jewellery therefore receives only the value of the precious metal actually contained within it. The melt value calculator allows you to calculate the material-value-based amount directly from gross weight and hallmark — the dealer's buying price is generally lower, as processing costs and margin are deducted.
Key steps for valuation:
- Determine the gross weight on a calibrated precision scale (accuracy ≥ 0.01 g).
- Read the hallmark or stamp and identify the fineness.
- Calculate fine weight: gross weight × fineness.
- Multiply 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 one-troy-ounce Krugerrand, for example, contains exactly 31.1035 g of fine gold (one troy ounce), but weighs approximately 33.93 g as a coin — the additional weight comes from the copper alloy content (fineness 916.7/1000; 22 karat). The gross weight is therefore measurably greater than the fine weight.
For fine bars (999.9), gross weight and fine weight are virtually identical; the minimal difference falls within the manufacturers' permitted tolerance limits.
Distinction from Related Terms
- Fine weight: The calculated precious metal content within the gross weight.
- Gross weight (in a trade context): May additionally include packaging or containers — do not equate with the raw weight of the object, although 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.
Key Takeaway
Gross weight is the starting point for every precious metal valuation — it is only by multiplying it by the fineness that the value-relevant fine weight is obtained. Anyone buying or selling jewellery, coins, or bars should always keep these two figures clearly separate and always relate the current metal price to the fine weight.