Pure-gold value in 1 gram of alloy
Live calculation: market price of a pure gram × 75.00%. This is metal value — neither a retail price nor a buy-back quote.
About this fineness
The value-versus-durability balance makes 18K the standard for fine jewellery. Buy-back counts metal only — brand and craftsmanship are not reimbursed, so the gap between boutique price and scrap value peaks at this fineness.
18K alloy is 75.00% pure gold. So one troy ounce of pure metal takes 41.5 g of this alloy, and a 10 g item holds 7.50 g of gold.
Against the neighbouring finenesses
| Fineness | Pure gold | Price per gram | Difference |
|---|---|---|---|
| 22K | 91.6% | $122.69 | +$22.23 |
| 18K | 75.0% | $100.46 | — |
| 14K | 58.5% | $78.36 | −$22.1 |
18K value by item weight
| Item weight | USD | EUR | GBP |
|---|---|---|---|
| 1 g | $100.46 | €89.45 | £75.56 |
| 2 g | $200.91 | €178.91 | £151.11 |
| 5 g | $502.29 | €447.27 | £377.78 |
| 10 g | $1,004.57 | €894.54 | £755.55 |
| 50 g | $5,022.87 | €4,472.72 | £3,777.75 |
| 100 g | $10,045.74 | €8,945.43 | £7,555.5 |
Exact math for any weight and currency — in the gold calculator.
Frequently asked questions
How much is 1 gram of 18K gold today?
The pure-gold content of 1 gram of 18K alloy is worth about $100.46 (75.00% of the per-gram market price). Retail sells above this value; buy-back pays below it.
Why do pawnshops pay less?
Buy-back values only the pure gold (75.0% of the item's weight) minus a refining/risk discount. Craftsmanship, brand and stones do not count in scrap pricing.
How does 750 fineness map to karats?
750 fine equals 18K: one karat is a 1/24 share of gold, so karats = fineness × 24 ÷ 1000.
Other finenesses
Pure gold price by currency — here. Not investment advice — disclaimer.