Use net gold-alloy weight in grams, pennyweight or troy ounces. Tare the container first and exclude stones, filler and other non-gold components from the calculator input.
1. Set up and tare
Put the scale on a stable, level surface and check its calibration using the manufacturer’s procedure and a suitable check weight. Select the unit before weighing. Place the empty tray on the scale and tare it to zero.
2. Sort before combining
Keep 10K, 14K, 18K and other confirmed purities separate. Record the net mass for each group. Avoid damaging a mounted stone or hollow item just to obtain a scrap weight; request a professional net-weight assessment where needed.
3. Copy both the reading and unit
Do not record more decimal places than the scale displays. A gram reading is not a troy-ounce reading. For example, 10 g equals about 6.4301 dwt or 0.321507 ozt. Unit switches in the calculator preserve the same mass.
| Scale unit | Mass in grams |
|---|---|
| 1 gram | 1 g |
| 1 pennyweight | 1.55517384 g |
| 1 troy ounce | 31.1034768 g |
| 1 ordinary ounce | 28.349523125 g |
4. Build the lot
Enter each purity group separately, then add it to the mixed lot. Compare the buyer’s total offer with the lot value and enter any fees to see the net payment.