goldprice.devFind the value of the gold you own by multiplying each piece's weight by its matching karat price, then adding the results. The gram prices are $128.35 for 24K, $117.65 for 22K and $96.26 for 18K. The combined gold content value is $5,048.33.
- Record each piece separately so its weight stays matched to its karat.
- Use the gold alloy weight and the corresponding karat price per gram.
- The total values the metal content; a buyer's offer will be lower.
List and weigh your pieces
Make a list with a separate entry for each chain, ring, bar or other item. Weigh each piece in grams. For jewellery with stones or other materials, use the gold alloy weight and keep the other weight separate.
The worked collection contains a twenty gram 22K chain, an eight gram 18K ring and a fifteen gram 24K bar. Keeping them on separate rows lets you apply a different gram price to each piece.
Match each stamp to its karat
Look for a purity stamp and record it beside the weight. The usual matches used here are 999 for 24K, 916 for 22K and 750 for 18K. These identify the karat row to use in the valuation.
If a stamp is missing, worn or unclear, confirm the purity before treating the result as reliable. Do not choose a karat from the item's colour or price. The calculation depends on knowing how much pure gold the alloy contains.
Find the matching gram prices
The prices are $128.35 per gram for 24K, $117.65 for 22K and $96.26 for 18K. They are US dollar spot values with a price time of 23 Oct 2026, 21:08 UTC. The prices are 15 minutes late.
The carat request below returns karat prices without a key or signing up. Choose the field for each piece. A karat price already allows for that karat's purity, so multiply it directly by the gold alloy weight.
The API's gram figures count gold as pure, while this site prices 24K gold at 99.9% purity. The API's gram figure is about 0.1% higher than the page's, so allow for this when comparing.
curl "https://api.goldprice.dev/v1/carat?currency=USD"Multiply each weight and add the values
Multiply the chain's weight by $117.65 per gram, the ring's weight by $96.26 and the bar's weight by $128.35. Add the resulting metal values. The worked collection totals $5,048.33 in gold content.
Keep each weight beside its karat, gram price and calculated value. Use the same method for your list. Do not apply another purity reduction after using a matching karat price, because that would reduce the value again.
| Piece | Weight | Karat | Price per gram | Value |
|---|---|---|---|---|
| Chain | 20 g | 22K | $117.65 | $2,353.00 |
| Ring | 8 g | 18K | $96.26 | $770.08 |
| Bar | 15 g | 24K | $128.35 | $1,925.25 |
| Total | 43 g | $5,048.33 |
Understand a buyer's offer
A buyer pays less than the spot gold content value to allow for melting, refining and a dealer margin. The calculation gives you a reference for the metal; it does not promise a sale amount.
Ask the buyer to state the weight, purity and deductions used in its offer. Compare those with your list. A difference in assumed karat or gold weight changes the metal value before any buyer charges are considered.
Separate retail price from metal value
A retail price is higher because it includes charges beyond the gold content. Making charges, dealer premiums and tax can add to what you pay for an item. Stones and other materials also sit outside this gold calculation.
Keep your metal total separate from purchase receipts and sale offers. Each answers a different question: what you paid, what the gold content is worth at the quote, and what a buyer will pay.