Quick answer: the gold content alone is worth the ring's weight multiplied by 75% (18 karat's pure gold proportion) multiplied by the current gold price. At a recent 24ct spot price of $280 NZD per gram, that works out to roughly $210 per gram for 18ct gold, meaning a 10-gram ring's gold content alone is worth around $2,100 NZD. Design, brand, and any gemstones can add meaningfully on top of that figure.
Thinking of selling your gold? We are a jewellery manufacturer with our own refinery, so we buy gold directly instead of reselling it to a refiner. That is why we can pay up to 100% of live gold value, and up to 20% above our standard rates for specific designer and luxury brands.
As a guide, at a 24ct spot price of NZD $280 per gram we pay around $105/g for 9ct, $164/g for 14ct, $210/g for 18ct and $256/g for 22ct. Your gold is XRF tested and weighed in front of you, and you are paid on the spot. Free valuation, no obligation.
New Zealand — Auckland gold buyers, 588 Chapel Road, Botany. Open 7 days, free parking.
United States — Houston gold buyers, 10311 North Eldridge Pkwy, B2.
What Is 18K Gold?
Gold purity is measured in karats out of 24, where 24k is 100% pure gold. Pure gold is very soft and prone to scratching, so goldsmiths alloy it with other metals to create a harder, longer-lasting piece. An 18k gold ring contains 75% pure gold, with the remaining 25% made up of metals like copper, silver, or nickel, a combination that keeps the ring both durable and richly coloured.
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Gold type
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Pure gold content
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Alloy content
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Hallmark stamp
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9ct gold (NZ/UK minimum standard)
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37.5%
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62.5% alloy metals
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375
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14ct gold
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58.3%
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41.7% alloy metals
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585
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18ct gold
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75%
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25% alloy metals
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750
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22ct gold
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91.6%
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8.4% alloy metals
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916
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Why 18K Gold for Jewellery?
18k gold is a genuinely popular choice for its balance of purity and durability: a rich, vibrant yellow that outshines lower-karat gold while still holding up well to daily wear and formal occasions alike. Browse our engagement ring collection if you're shopping for a new piece rather than valuing an existing one.
Factors That Affect the Value of an 18K Gold Ring
1. Gold Weight
Weight is the single biggest driver of value, since gold is priced per gram. A heavier ring contains more gold and is worth proportionally more, all else being equal.
2. Current Gold Market Price
Gold's price fluctuates daily based on global market conditions, which directly affects what a ring is worth at any given moment. Always check a live rate rather than relying on a figure from even a few months ago.
3. Ring Design and Brand
A well-known brand or designer, intricate craftsmanship, or set gemstones can add meaningful value beyond the raw gold content itself.
4. Condition of the Ring
A ring in good condition, with minimal wear or damage, generally fetches a better offer than a heavily worn piece, particularly where gemstones are involved.
5. Resale Value vs Retail Value
The gap between what you pay retail and what you'd get reselling is usually significant, and it's worth understanding why rather than being surprised by it. A retail purchase includes design, craftsmanship, and brand on top of the gold itself; a resale offer, particularly from a scrap buyer, is typically based on gold content alone. A jewellery manufacturer buying gold directly, rather than reselling to a refiner, can generally offer meaningfully more than a generic buyer, since there's no middleman margin being taken out of the price.
How to Estimate the Value of an 18K Gold Ring
Weigh your ring: use a jeweller's scale, measured in grams. If you don't have access to one, a local jeweller can weigh it for you.
Check the current rate: use TJ Diamond's live per-karat buy rate (see the rate box above) or a live gold calculator, rather than an old or estimated figure.
Calculate the value: multiply your ring's weight by the current buy rate for its karat.
Worked example: at a 24ct spot price of $280 NZD per gram, TJ Diamond's 18ct buy rate is approximately $210 per gram. A 10-gram 18ct ring is therefore worth approximately 10 x $210 = $2,100 NZD in gold content alone, before any additional value from brand, craftsmanship, or gemstones.
Consider other factors: a luxury brand or set gemstones can add substantially on top of the base gold value, and a ring in excellent condition generally fetches a better offer than a damaged one.
Selling Your 18K Gold Ring
Get your ring XRF tested and weighed in person, ask for the current buy rate at your ring's specific karat, and get more than one valuation if the ring may carry designer or luxury brand significance. Browse our yellow gold engagement ring collection or our halo engagement ring collection if you're shopping for a replacement piece.
The Bottom Line
How much is an 18k gold ring worth? Weight, purity, and the live gold price set the baseline; design, brand, and condition add on top. Check TJ Diamond's live gold calculator or bring your ring in for a free, no-obligation valuation with XRF testing and same-visit payment.
Frequently Asked Questions
Q1: How much is an 18k gold ring worth?
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The gold content alone is worth the ring's weight in grams multiplied by 75% (18 karat's pure gold proportion) multiplied by the current gold price per gram. As a live example, at a recent 24ct spot price of $280 NZD per gram, TJ Diamond's buy rate for 18ct gold is approximately $210 per gram, meaning a 10-gram 18ct ring's gold content alone is worth approximately $2,100 NZD. This is the metal value only; design, brand, and gemstones can add meaningfully on top, and this figure moves daily with the gold price.
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Q2: How do you calculate the value of an 18k gold ring yourself?
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Weigh the ring in grams, then either multiply by TJ Diamond's current 18ct buy rate per gram directly, or multiply the weight by 0.75 (18 karat's pure gold percentage) to get the pure gold content, then multiply that by the current price per gram of pure (24k) gold. Both methods give the same underlying melt value. This is the gold content only, not including craftsmanship, brand, or any gemstones.
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Q3: Why is the resale value of an 18k gold ring so much lower than the retail price?
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Because the retail price includes far more than the raw gold: design, craftsmanship, branding, and retail margin all add to what you pay when buying new. When selling, most buyers, particularly scrap or pawn buyers, are only paying for the gold content itself, not the work or brand behind it. A reputable jewellery manufacturer who buys gold directly, rather than reselling to a refiner, can typically offer meaningfully more than a generic gold buyer, since there's no middleman markup being deducted from the offer.
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Q4: Does the brand or designer of an 18k gold ring affect its resale value?
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Yes, though the effect is inconsistent. Rings from well-known or historically significant jewellery houses can carry a premium above their raw gold value, sometimes substantially. For most rings without a specific designer pedigree, resale value tracks closely to the gold content plus a modest allowance for craftsmanship and condition. Some gold buyers, including TJ Diamond, pay above standard rates specifically for recognised designer and luxury brand pieces.
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Q5: What's the difference between 18ct, 14ct, and 22ct gold ring values at the same weight?
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Value scales directly with pure gold content: 18ct is 75% pure, 14ct is 58.3% pure, and 22ct is 91.6% pure. At an identical weight, an 18ct ring's gold content is worth roughly 29% more than the same ring in 14ct, and an 22ct ring is worth roughly 22% more again than 18ct. As a live reference at a 24ct spot price of $280 NZD per gram, buy rates work out to approximately $164/g for 14ct, $210/g for 18ct, and $256/g for 22ct.
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Q6: How is my gold ring tested and weighed when selling?
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A reputable buyer uses XRF (X-ray fluorescence) testing, a fast, non-destructive method that identifies the exact metal composition and purity of your ring without damaging it. Your ring should be weighed and tested in front of you, with the result and offer explained clearly before you agree to sell. Be cautious of any buyer unwilling to test and weigh your item in your presence.
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Q7: Does the condition of an 18k gold ring affect its value?
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Yes, though less than weight and purity. A ring in good condition, free of significant damage, may fetch a slightly better offer than a heavily worn or damaged piece, particularly if any gemstones are involved that could be reused or resold. For pure gold content value specifically, condition has a smaller effect than for pieces being valued on craftsmanship or design, since the gold itself doesn't lose value from cosmetic wear.
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Q8: Where can you get the best price selling an 18k gold ring in NZ?
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A jewellery manufacturer who buys gold directly and has their own refinery relationship, rather than reselling to a third-party refiner, can typically pay closer to full live gold value than a generic pawn shop or reseller, since there's no middleman margin being deducted. Get your ring tested and weighed in person, ask for the current buy rate per gram at your ring's specific karat, and get more than one valuation for a ring of meaningful value or with potential designer significance.
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