10K vs 14K vs 18K vs 22K vs 24K Gold Value
What each karat contains, what it is worth per gram at the same spot price, and which one actually suits what you own.
Updated June 20, 2026
What karat actually measures
Karat is a purity fraction with 24 as the denominator. An item described as 18K contains 18 parts gold to 6 parts other metal by weight, which is 75% gold. 14K is 14 parts in 24, or 58.33%. 10K is 41.67%, the legal minimum that can be sold as gold in the United States. Pure gold is alloyed for two reasons. The first is hardness: 24K gold is soft enough to scratch with a fingernail and deform under normal wear, so a 24K ring worn daily will lose its shape and its detail. The second is colour and cost: copper pushes gold pink, silver and zinc push it pale, and nickel or palladium plus rhodium plating make white gold. This means karat is a trade-off rather than a quality ranking. A 10K ring is more durable than a 22K ring and will hold a stone setting better. A 22K bangle holds more value per gram and resells closer to spot. Neither is the correct answer in the abstract.
Value per gram at the same spot price
The clearest way to see the difference is to hold the spot price fixed and compare per-gram gold content. At $4,060 per troy ounce, a gram of pure gold is $130.53. Multiply by the karat decimal: 24K (0.999) = $130.40 per gram. 22K (0.9167) = $119.66. 21K (0.875) = $114.21. 18K (0.750) = $97.90. 14K (0.5833) = $76.14. 10K (0.4167) = $54.39. 9K (0.375) = $48.95. The spread is larger than most people expect. A gram of 18K carries 1.80 times the gold value of a gram of 10K. A gram of 22K carries 2.20 times. On a 30 gram lot that is the difference between $1,632 and $3,590 - same weight on the scale, nearly $2,000 apart. The practical consequence: never compare two pieces by weight alone, and never accept a per-gram offer without confirming which karat it applies to.
Why heavier low-karat often beats lighter high-karat
Because value is weight multiplied by purity, a big 10K piece can easily contain more gold than a small 18K piece. A 40 gram 10K curb chain holds 16.7 grams of fine gold. A 12 gram 18K pendant holds 9 grams. The chain is worth roughly 85% more despite being "lower quality" gold. This catches people out in both directions. Sellers overvalue small high-karat items and undervalue heavy chunky low-karat ones. Buyers of secondhand jewelry sometimes pay a premium for an 18K stamp on a piece that is mostly air. The fix is to always compute fine gold weight - grams times karat decimal - and compare that number across items. It is the only figure that maps directly to money.
Where each karat shows up
24K appears almost exclusively as bullion: bars, Maple Leafs, Buffalos, Britannias, Pandas, Philharmonics. It also appears as jewelry in parts of East and Southeast Asia, where jewelry doubles as a savings vehicle and resale value matters more than wearability. 22K (916) is the South Asian jewelry standard and also the alloy of the Krugerrand and the American Gold Eagle. 21K (875) dominates Gulf markets. 23K (958) is common in Thai jewelry. 18K (750) is the European fine jewelry standard and the default for luxury watches and designer pieces - it holds a stone securely while still being three-quarters gold. 14K (585) is the workhorse of the US market: durable, affordable, and by far the most common karat in American scrap lots. 10K (417) is US budget jewelry, class rings and mass-market chain. 9K (375) is the UK and Australian equivalent and is not legally saleable as gold in the US. Knowing the regional norm is useful when you find an unmarked piece: a heavy yellow bangle bought in Dubai is probably 21K, the same shape bought in a US mall is probably 10K or 14K.
Reading the stamps
Most of the world stamps millesimal fineness rather than karat. The pairs to memorise: 999 is 24K, 958 is 23K, 916 is 22K, 875 is 21K, 750 is 18K, 585 is 14K, 417 is 10K, 375 is 9K, 333 is 8K. Older US 14K jewelry is sometimes stamped 583 instead of 585. That is not a defect - it reflects the legal half-karat tolerance permitted on unplumbed gold. Pieces stamped "14K plumb" or "14KP" are guaranteed to be a full 14K with no tolerance applied. Stamps that are not solid gold: GP and GEP (gold plated), HGE (heavy gold electroplate), RGP (rolled gold plate), GF and the fractional forms like 1/20 12K GF (gold filled), and vermeil (gold over sterling). Gold filled is genuinely refinable at roughly 5% gold by weight but most buyers decline it; plated goods have no meaningful melt value.
Which karat holds value best on resale
Two different questions get mixed up here: which karat holds value as metal, and which holds value as jewelry. As metal, higher karat resells closer to spot. Refiners prefer 22K and 24K because the gold content is high and the alloy is simple, so less is lost in processing and assay is easier. Low-karat and mixed material carries more processing cost per gram of recovered gold, which shows up as a lower payout percentage. As jewelry, karat barely matters compared with brand, condition and design. An 18K piece from a recognised house holds a large fraction of retail. An unbranded 22K chain holds close to melt and little more. If resale value is the reason you are buying, buy either bullion or brand - the middle ground loses the most.
Key points
Karat is a fraction of 24: 18K is 75% gold, 14K is 58.3%, 10K is 41.7%. At the same weight, 18K carries 1.8x the gold value of 10K. Higher karat means more value and more softness - it is a trade-off, not a ranking. Regional norms differ: 14K dominates the US, 18K Europe, 22K South Asia, 21K the Gulf.