Understanding Gold Purity: Karatage & Hallmarks Explained

5 min read

Learn what karats mean, how purity is measured, and why hallmarking matters in gold jewellery.

Gold purity is measured in karats (K), a system that tells you exactly how much pure gold is in your jewellery. Understanding this ensures you're getting value for your money.

What Do Karats Mean?

A karat is 1/24th of pure gold. So:

**24K gold** = 100% pure gold (too soft for jewellery)

**22K gold** = 91.67% pure gold (common for Indian jewellery)

**18K gold** = 75% pure gold (popular for rings, pendants)

**14K gold** = 58.33% pure gold (durable, value option)

The remaining percentage is alloy metals (copper, silver, zinc) that add strength.

BIS Hallmarking in India

In India, the Bureau of Indian Standards (BIS) hallmark guarantees gold purity. A certified hallmark includes:

**Purity code** (916 for 22K, 750 for 18K, 585 for 14K)

**BIS Logo** — your assurance of government certification

**Jeweller's hallmark ID** — tracks the maker

**Date code** — when it was marked

When you buy hallmarked gold from a verified jeweller on JewelMark, you get this guarantee. Look for the BIS logo before purchase.

Why Purity Matters

Pure gold doesn't tarnish or corrode. Higher karat = better longevity and resale value. Lower karatage is more durable for everyday wear (like engagement rings), but holds less intrinsic value.

Always ask for a purity certificate with your purchase.

Shop authentic hallmarked gold on [JewelMark's gold collection](/gold-jewellery).