Step 1: total weight
Weigh the jewelry on a digital scale with an accuracy of at least a tenth of a gram. A regular kitchen scale is usually not accurate enough for small items. Weigh each purity level separately.
Write down the weight for each group. This is the first figure in the calculator.
Step 2: deductions
Subtract the weight of stones, pearls, steel springs, glass, or glue. When there is no way to weigh separately, a rough estimate is sufficient for an approximation; the physical test will determine the final result.
The result is the net weight.
Step 3: pure gold
Multiply the net weight by the purity: 0.375 for 9K, 0.585 for 14K, 0.75 for 18K, 0.875 for 21K, 0.916 for 22K, and 0.999 for 24K.
For example: 12 grams net of 14K = 7.02 grams of pure gold.
- 9K = 375
- 14K = 585
- 18K = 750
- 21K = 875
- 22K = 916
- 24K = 999
Full example with several items
Suppose a box with three items: an 8-gram 14K chain, a 4.5-gram 18K ring with a stone of about 0.2 grams, and a 1.2-gram 14K single earring. Grouping: 14K — 9.2 grams; 18K — 4.3 grams net.
Pure gold: 9.2 times 0.585 = 5.382 grams, plus 4.3 times 0.75 = 3.225 grams. Total 8.607 grams pure gold. This number is multiplied by the current reference price to get a theoretical value — which is the theoretical upper limit, not the amount that will be paid.
- Group by purity
- Remove stones before multiplying
- Add the pure gold from all groups
Accuracy of home weighing
Cheap digital pocket scales can deviate by a few tenths of a gram. In small items, this is a significant difference in percentages. It is advisable to calibrate according to the manufacturer's instructions, weigh on a stable surface, and repeat the weighing twice.
Even if home weighing is not completely accurate, it gives a good order of magnitude for comparison. The binding weighing is done during the physical inspection.
Step 4: price and payment
The pure gold price per gram is calculated based on XAU/USD divided by 31.1034768 multiplied by the USD/ILS exchange rate. Any price shown on the site is a non-binding estimate. Multiplying the pure gold by this price gives a theoretical value.
The actual payment is lower than the theoretical value due to testing, refining, and handling costs. Ask every gold buyer how much they pay per gram of pure gold — this is a good way to compare.