The core difference is gold content
22K and 18K are both real gold alloys, but they contain different proportions of gold. In India's BIS hallmarking system, 22K corresponds to 916 fineness and 18K corresponds to 750 fineness.
That means 22K/916 contains approximately 91.6% gold, while 18K/750 contains 75% gold. The remaining proportion is alloying metal used to change hardness, colour and working properties.
Why 22K is common in traditional jewellery
22K has high gold content and is widely associated with traditional Indian jewellery. Its richer gold colour and higher metal value per gram appeal to buyers who prioritise gold content.
The trade-off is that higher-purity gold is softer. Intricate daily-wear designs or jewellery holding stones may benefit from a harder alloy.
Why 18K is common in modern and stone-set designs
18K contains more alloying metal than 22K, which can make it stronger for certain designs and settings. It is widely used for diamond and gemstone jewellery and is also common in white and rose gold.
Lower gold content means the 18K benchmark metal value per gram should be lower than a same-time 22K benchmark. That does not guarantee the finished 18K piece will always have a lower final invoice because design, stones and making charges can dominate the retail cost.
| Feature | 22K / 916 | 18K / 750 |
|---|---|---|
| Approximate gold content | 91.6% | 75% |
| BIS fineness mark | 916 | 750 |
| Common use | Traditional/plain gold jewellery | Stone-set, modern, white/rose gold designs |
| Relative softness | Softer | Generally harder |
| Metal value per gram | Higher, all else equal | Lower, all else equal |
Use the right benchmark when comparing prices
IBJA publishes separate reference rates for 916 and 750 fineness. A common mistake is to compare an 18K shop price with a 22K or 24K online rate and conclude that one retailer is overcharging or undercharging.
Always match the purity first. Then compare net gold weight, making charges, stones and GST.
The invoice can matter more than the headline gold rate
For plain gold jewellery, the metal value may dominate the bill. For a diamond ring or heavily designed piece, stone value and workmanship can be much larger components.
CBIC's jewellery FAQ states that GST on retail jewellery is payable at 3% of the total transaction value, whether the making charge is shown separately or not. That is why the final payable amount should be compared, not only the “gold rate” line.
Hallmark and HUID checks
BIS says hallmarking provides third-party assurance of declared purity. A modern hallmarked item should be checked for the relevant purity/fineness and HUID details.
If a seller calls a piece “22K,” the marked purity and invoice should align with 916. If a piece is sold as 18K, the corresponding fineness is 750.
Which is better?
There is no universal winner. A buyer wanting high gold content in traditional jewellery may prefer 22K. A buyer prioritising stone security, white-gold colour or a harder everyday alloy may find 18K more suitable.
The correct choice depends on design, use, budget and whether the buyer values gold content or structural properties more strongly.
FAQ
Is 22K the same as 916 gold?
Yes. BIS lists 22K gold jewellery at 916 fineness.
Is 18K gold fake because it contains only 75% gold?
No. 18K/750 is an established gold-jewellery purity grade. The remaining 25% consists of alloying metals.
Can an 18K jewellery item cost more than a 22K item?
Yes. Stones, brand, design and making charges can make the finished 18K product more expensive even though its gold content per gram is lower.
