24K vs 22K vs 18K Gold: Understanding Gold Purity

Walk into any jewellery shop in India and you will hear terms like 24 karat, 22 karat, and 18 karat. But what do these numbers actually mean? Understanding gold purity is essential whether you are buying jewellery for a wedding or investing in gold for wealth building.

What Is a Karat?

Karat (abbreviated as K or KT) is the unit used to measure the purity of gold. Pure gold is 24 karats. The karat number tells you how many parts out of 24 are pure gold.

• 24K gold: 24 out of 24 parts are pure gold = 99.9% pure
• 22K gold: 22 out of 24 parts are pure gold = 91.6% pure
• 18K gold: 18 out of 24 parts are pure gold = 75% pure
• 14K gold: 14 out of 24 parts are pure gold = 58.3% pure

The remaining parts in lower karat gold consist of other metals like silver, copper, zinc, or nickel. These metals are added to make the gold harder and more suitable for jewellery.

24K Gold: The Purest Form

24K gold is 99.9% pure gold with virtually no other metals mixed in. It has a rich, bright yellow colour that is unmistakable.

Characteristics:

• Extremely soft and malleable
• Bright, deep yellow colour
• Most expensive per gram
• Not ideal for jewellery as it bends and scratches easily

Best used for: Gold coins, gold bars, digital gold investments, and gold biscuits. When you buy investment-grade gold, it is always 24K.

22K Gold: The Jewellery Standard

22K gold is the most popular choice for gold jewellery in India. It contains 91.6% gold and 8.4% other metals, which give it the strength needed for everyday wear.

Characteristics:

• Slightly harder than 24K, suitable for jewellery
• Rich yellow colour, slightly less intense than 24K
• Standard for traditional Indian jewellery
• Good balance between purity and durability

Best used for: Traditional Indian jewellery like necklaces, bangles, earrings, and wedding sets. Most gold jewellery sold in India is 22K.

18K Gold: Durable and Stylish

18K gold contains 75% gold and 25% other metals. The higher proportion of other metals makes it significantly harder and more durable than 22K or 24K gold.

Characteristics:

• Much harder and more durable
• Slightly paler yellow; can also come in rose gold and white gold variants
• More affordable per gram than 22K or 24K
• Ideal for intricate designs and stone-studded jewellery

Best used for: Contemporary and designer jewellery, diamond-studded pieces, watches, and everyday wear items like rings.

Price Comparison

The price difference between karats is directly proportional to the gold content. If 24K gold is priced at Rs 8,500 per gram, then:

• 22K gold: Approximately Rs 7,790 per gram (91.6% of 24K price)
• 18K gold: Approximately Rs 6,375 per gram (75% of 24K price)
• 14K gold: Approximately Rs 4,960 per gram (58.3% of 24K price)

However, when buying jewellery, the final price also includes making charges and GST, which can add 10-30% to the base gold cost.

How to Identify Gold Purity

In India, the Bureau of Indian Standards (BIS) hallmarking system helps you identify gold purity. A BIS hallmark includes:

• BIS logo: A triangle with the BIS mark
• Purity grade: Marked as a number (e.g., 999 for 24K, 916 for 22K, 750 for 18K)
• HUID: A unique 6-digit alphanumeric Hallmark Unique Identification number

Since June 2021, BIS hallmarking has been made mandatory for gold jewellery sold in India. Always check for the hallmark before buying.

Which Karat Should You Choose?

• For investment purposes: Always choose 24K. It offers the purest form of gold and is easiest to sell at market rates.
• For traditional jewellery: 22K is the best choice. It offers high purity with enough durability for regular wear.
• For everyday fashion jewellery: 18K is ideal. It is durable, affordable, and comes in trendy designs and colours.

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