Knowing what your gold jewelry is truly worth protects you whether you are buying, selling, or insuring it. The good news is that the underlying math is simple and entirely transparent. Once you understand the four inputs โ purity, weight, spot price, and markup โ you can value almost any piece with confidence.
Step 1: Convert karat to purity
Gold purity is expressed in karats, where 24K is essentially pure gold. To find the actual gold content as a percentage, divide the karat number by 24.
- 24K โ 99.9% pure gold
- 22K โ 91.6% gold
- 21K โ 87.5% gold
- 18K โ 75% gold
- 14K โ 58.3% gold
A hallmark stamped inside a ring or on a clasp usually tells you the karat. If there is no mark, a jeweler can test it.
Step 2: Weigh the piece in grams
Use an accurate scale that reads to at least one tenth of a gram. Remove any non-gold elements first โ gemstones, clasps made of other metals, or enamel can add weight that is not gold. For a piece set with stones, the jeweler typically estimates the stone weight and subtracts it.
Step 3: Apply the live spot price
The spot price is the global market price of pure gold, usually quoted per troy ounce and easily converted to a per-gram figure. The pure-gold value of your item is:
Gram weight ร purity ร spot price per gram
For example, a 10-gram 18K chain contains 7.5 grams of pure gold (10 ร 0.75). Multiply that by the current per-gram spot price to get its intrinsic gold value. Because the spot price moves constantly, always use a current figure โ our gold calculator does this instantly for any karat and currency.
Step 4: Account for making charges and markup
Retail jewelry sells above its melt value because you also pay for craftsmanship, branding, and the shop's margin. These making charges can range from a small percentage on plain bullion-style chains to well over the metal value on intricate or designer pieces.
When you sell jewelry, the reverse applies: dealers buy near the melt value and rarely pay for the original making charges. Expect an offer somewhat below the pure-gold value, since the buyer needs a margin to refine or resell.
Putting it together
To estimate a fair price, start from the intrinsic gold value and adjust for context:
- Buying retail โ intrinsic value plus making charges and tax.
- Selling scrap โ intrinsic value minus the dealer's margin.
- Insuring โ usually replacement value, closer to retail.
Branded or antique pieces can carry a collectible premium beyond their gold content, but for everyday jewelry the melt value is the anchor that keeps any quote honest.
A quick worked example
Imagine a 22K bangle weighing 15 grams. Its pure gold content is 15 ร 0.916 = 13.74 grams. Multiply by the live per-gram spot price and you have the metal value in seconds. From there you simply add making charges if buying, or subtract a dealer margin if selling. Run the numbers yourself with the gold calculator before you walk into any shop, and you will never be caught off guard.