What 18 Carat Gold Is and Why It Matters
18 carat gold is one of the most common – and most misunderstood – gold purities in modern Indian jewellery. The single most important fact: 18 carat gold contains exactly 75% pure gold and 25% other metals (alloys like copper, silver, palladium, or zinc). This 75% figure is fixed by the Bureau of Indian Standards and appears as the ‘750’ hallmark on every authentic piece of 18 carat gold sold today. Whether you own a diamond ring, a designer chain, or a watch case in 18 carat gold, understanding this percentage is the key to knowing the real cash value of what you are holding.
This guide covers everything you need to know about 18 carat gold: today’s live rate, how the 750 hallmark works, the colour variations (yellow, white, rose), the trade-offs versus 22K and 24K, where 18 carat gold is most commonly used, and exactly how much cash you can expect when selling it. Whether you are buying or planning to sell, by the end you will know precisely what your 18 carat gold piece is worth at today’s market rate.
18 Karat Gold at a Glance
| Attribute | 18K Gold |
| Pure Gold Content (18 carat gold percentage) | 75% (= 750 / 1000 fineness) |
| Other Metals (alloys) | 25% – usually copper, silver, zinc, or palladium |
| BIS Hallmark | 750 (also ’18K’) |
| Common Use | Diamond jewellery, lightweight chains, designer pieces, watches |
| Today’s Rate | See live rate widget below |
| Resale Value | 75% of today’s 24K rate per gram, less small refining margin |
Today’s Live 18 Carat Gold Rate
The 18 carat gold rate today is calculated as 75% of today’s 24K rate per gram. So if 24K is trading at ₹6,800/g, the 18 carat gold rate works out to roughly ₹5,100/g. This proportion stays constant – it is a function of purity, not market sentiment. The 18k gold rate moves with the international gold spot, the rupee–dollar rate, and Indian import duty, exactly like 22K and 24K.
Use the widget below to check the 18 carat gold price today across India. Buyers reference the IBJA twice-daily rate plus live MCX moves. The 18k gold price in india is fairly uniform city-to-city, with only minor handling differences (₹10–₹50/g) between metros.
What is 18 Karat Gold? Purity, Hallmark, and Composition
What is 18 karat gold made of? Pure gold (24K) is too soft to hold the shape of a ring, chain, or setting around a diamond – it bends easily. To make jewellery durable, gold is mixed with stronger metals. The 18 carat gold purity standard sets the mix: 75% pure gold, 25% alloy. This makes the piece much harder than 24K, while still being recognisably ‘gold-coloured’.
The exact alloy mix determines the colour. White gold uses palladium or nickel; yellow gold uses copper and silver in roughly equal parts; rose gold uses more copper. All three are still 18 karat gold – the colour is decorative, the gold content is identical at 75%.
How to Identify Genuine 18 Carat Gold: The Hallmark
The 18 carat gold hallmark used in India is the BIS ‘750’ mark – a tiny stamp impressed on the piece, indicating 750 parts per thousand purity (= 75%). Since June 2021, BIS hallmarking is mandatory for new gold jewellery sold in India. Look for these elements on a hallmarked 18K piece:
• BIS logo (a triangular mark with ‘BIS’ inside).
• Purity grade – ‘750’ for 18K gold (other gradings: 916 for 22K, 999 for 24K, 585 for 14K).
• Six-digit Hallmark Unique ID (HUID) – alphanumeric, traceable on the BIS Care app.
• Jeweller’s identification mark.
If you own older 18 karat gold from before 2021, it may not have the HUID – only the 750 hallmark and BIS triangle. This is still genuine. To verify, any reputable buyer can run an XRF test that confirms 75% purity in seconds, regardless of hallmark status.
18 Karat Gold vs 22K vs 24K: Which Should You Choose?
Indian jewellery has historically been dominated by 22K (91.6% pure), but 18 karat gold has steadily gained ground over the last 20 years – especially for diamond and gemstone settings, where the harder alloy is necessary to grip stones. Each purity has trade-offs:
| Purity | Pure Gold % | Best For | Resale Value |
| 18 carat gold | 75% (750 hallmark) | Diamond jewellery, designer pieces | Strong – XRF-tested 75% |
| 22 carat gold | 91.6% (916 hallmark) | Traditional Indian jewellery | Highest among jewellery purities |
| 24 carat gold | 99.9% (999 hallmark) | Investment coins and bars | Highest per gram (investment grade) |
If you are buying gold purely as an investment, 24K coins or bars give the best capital efficiency. If you are buying jewellery you intend to wear daily and possibly sell later, 22K is traditional. If you are buying diamond-set or gemstone-set pieces, 18 carat gold is functionally the right choice – the harder alloy holds stones securely. None is ‘better’ in the abstract; it depends on the use case.
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Where 18 Karat Gold Is Commonly Used
18k gold dominates several categories of modern jewellery in India:
• Diamond jewellery – engagement rings, solitaires, pendants, earrings (the alloy strength holds the stones).
• Designer and lightweight chains – better hardness means thinner profiles last longer.
• Watches – luxury watch cases (Cartier, Rolex, etc.) frequently use 18 karat gold.
• Gemstone-set ornaments – rubies, sapphires, emeralds are usually set in 18K rather than 22K.
• Children’s and everyday-wear pieces – durability matters more than maximum gold content.
Resale Value: How Much Will You Get Selling 18 Carat Gold?
The 18 carat gold price in india for resale is straightforward: 75% of today’s 24K rate per gram, multiplied by your piece’s weight, minus fair deductions for stones and any other non-gold elements (like rhodium plating on white gold, which has negligible value). So 10g of 18K jewellery, with ₹6,800/g 24K rate, gives 10 × 0.75 × ₹6,800 = ₹51,000 gross – minus stone weight and any solder.
One caution specific to 18 carat gold: many pieces are diamond-set or gemstone-set. Reputable buyers like Attica Gold pay only for the gold content – not the stones. Diamonds in particular are notoriously hard to value at resale (the original retail markup over wholesale is typically 50–80%). So if your piece had a ₹2 lakh price tag of which the gold was ₹50,000 and the diamond was ₹1.5 lakh, expect to receive close to ₹50,000 for the gold and a much smaller amount (or sometimes nothing) for the stone.
Always request that stones be removed and returned to you before the gold is weighed – that way you can sell the gold immediately and decide separately what to do with the stones.
Common Questions About 18 Karat Gold
Many first-time owners ask whether the 750 hallmark gold mark guarantees the piece is ‘real’ – yes, BIS hallmarking is legally enforceable and verified through HUID. Others ask if their piece is ‘really’ 18K when the colour looks slightly different – this is the alloy mix at work; yellow, white, and rose 18 karat gold all contain identical 75% pure gold. The XRF test settles any doubt in seconds.
Why Choose Attica Gold to Sell Your 18 Karat Gold
18 karat gold is one of the most useful and most misunderstood gold purities in modern Indian jewellery. The 750 hallmark is your guarantee that the piece contains 75% pure gold; XRF testing is your guarantee that the resale price reflects this exact content. Whether you bought 18K for a diamond setting, a lightweight design, or because it suited your budget, the resale value is straightforward – 75% of today’s 24K rate per gram, multiplied by your piece’s weight, minus fair deductions for stones and solder.
Attica Gold accepts all karat purities – 14K, 18K, 22K, 24K – at every one of its 200+ branches across South India. Purity is tested by XRF in your presence; the rate applied is today’s live IBJA benchmark; deductions are listed line by line on your written receipt; payment is instant in your chosen mode. There’s no penalty for selling 18K instead of 22K, no ‘low purity’ surcharge, no hidden cuts. If you’ve been holding 18 karat gold and wondering whether it’s worth selling, the answer is: yes, at a fair price, today. Your wait is over – walk into your nearest Attica Gold branch for a free, no-obligation valuation in 20 minutes.
Frequently Asked Questions
What is 18 karat gold and how pure is it?
18 karat gold (also called 18K gold or 18 carat gold) is gold that is 75% pure – the rest 25% is alloy metals like copper, silver, zinc, or palladium. The 18 carat gold percentage is fixed by BIS standards at 75% (= 750/1000 fineness), and is identified by the ‘750’ hallmark stamp.
What is the 18 carat gold rate today in India?
The 18 carat gold rate today is approximately 75% of today’s 24K rate per gram. So if 24K is at ₹6,800/g, the 18k gold rate is around ₹5,100/g. The rate moves with international spot, the rupee–dollar rate, and Indian import duty. Use the live rate widget above for today’s exact 18 carat gold price.
What does the 750 hallmark gold mark mean?
The 750 hallmark gold mark is the BIS-certified purity indicator for 18 carat gold – meaning 750 parts pure gold per 1000, or 75% purity. It is one of three jewellery purity grades in the BIS hallmark system: 750 (18K), 916 (22K), 999 (24K), plus 585 for 14K.
Is the 18k gold price in india the same across cities?
Largely yes. The 18k gold price in india is set by IBJA nationally, with minor city-to-city differences (₹10–₹50/g) for local handling. The bigger price differences come from buyer-to-buyer margins, not city-to-city. Bangalore, Chennai, Hyderabad, Mumbai, and Delhi all trade within a narrow band.
Why is 18 carat gold often used for diamond jewellery?
Diamond and gemstone settings need a harder metal to grip stones securely. Pure 24K gold is too soft and would deform; 22K is softer than 18K and bends more easily. 18 carat gold is the right balance – hard enough to hold stones over decades, while still being a recognisable gold colour. This is why almost all diamond jewellery worldwide uses 18K.
Can I sell 18 carat gold without a hallmark?
Yes. Hallmarking became mandatory for new sales only in June 2021, so older 18 karat gold pieces may not have the 750 mark. Reputable buyers test purity using XRF (X-ray fluorescence), which measures actual gold content in seconds – regardless of hallmark status. The price is based on tested purity, not paperwork.
How much will I get if I sell my 18 karat gold?
The 18 carat gold price you receive is calculated as: weight × 75% × today’s 24K rate − fair deductions for stones and solder. So 10g of 18K gives roughly 7.5g of pure gold value at today’s rate. For diamond-set pieces, ask the buyer to remove stones and pay only for the gold; diamonds are best valued separately.
What is the difference between 18k gold and 18 carat gold?
There is no difference – they are different ways of writing the same purity. ’18K’ is the international shorthand; ’18 carat’ is the longer form. Both refer to gold that is 75% pure, marked with the 750 hallmark in India. The same applies to 22K vs 22 carat, and 24K vs 24 carat.
Want to know exactly what your 18 karat gold is worth today?
Visit your nearest Attica Gold branch for a free XRF purity test and a transparent written quote at today’s live rate.
