Gold Karat Converter

Karat (K) measures gold purity on a scale of 24. 24 karat means 99.9% pure gold. 22 karat means 22 parts gold and 2 parts other metals (like silver or copper), making it 91.6% pure. The BIS hallmark system uses a 3-digit number: 999 for 24K, 916 for 22K, 750 for 18K, etc.

22K (916 hallmark) is the most popular for jewellery in India. It is pure enough to have a rich gold colour and warm lustre, yet durable enough for daily wear. For diamond-set or modern designs, 18K is preferred as it holds prongs better due to higher alloy content.

24K gold is nearly 100% pure and extremely soft — too soft for most jewellery as it bends and scratches easily. It is mainly used for gold coins, bars, and investment products. Some traditional temple jewellery uses 24K, but it is rare.

18K gold contains only 75% pure gold compared to 91.6% in 22K. Since pure gold is the valuable component, a piece weighing the same will have less actual gold content in 18K, making it less expensive per gram in gold value. However, making charges, craftsmanship, and stone settings may add significantly to the final price.

Look for the BIS hallmark stamp on the jewellery — a 3-digit number (916, 750, etc.) indicates purity. You can also use a jeweller's acid test kit. For a definitive answer, take the piece to a BIS-certified hallmarking centre for assaying.