✔ Live 18K (750) gold price for India
✔ Complete 18K vs 22K vs 24K purity & price comparison
✔ Step-by-step purity verification methods
💡 Key Takeaway:
18K = 750 hallmark = 75% pure gold + 25% alloy. It is the jewellery grade for diamonds and studded pieces — strong, durable and secure for gemstones. 22K (916) is for plain ornaments; 24K (999) is for coins/bars/investment; 18K (750) is for diamond & western-style jewellery. Always buy BIS-hallmarked 18K with a 6-digit HUID and an itemised bill.
🟡 Live Gold Rate Today (India) — 24K / 22K / 18K
📐 The 18K Gold Definition
If you have ever shopped for a diamond ring, an engagement band, or studded jewellery from brands like Tanishq, Kalyan, Cartier or Tiffany, you will have noticed the number "750" or "18K" stamped inside the piece. Walk into any premium jeweller and almost every diamond-set ornament — rings, earrings, pendants, bracelets — carries this mark. But what does 18K actually mean? Is it "real" gold? Is it as valuable as the 22K jewellery your grandmother wears? And why do jewellers insist on 18K for diamonds?
This guide explains everything about 18K gold — its exact purity, its alloy composition, why it is the global standard for diamond jewellery, how its price compares with 22K and 24K, the three colour variants (yellow, rose, white), how to verify it, and the smart way to buy it. By the end, you will know more about 18K gold than 95% of Indian buyers.
Table of Contents
1. What Does 18K Mean in Gold? (The Simple Answer)
"18K" (or "18 Karat") is a purity grade. It tells you that 18 out of 24 parts of the metal are pure gold — in other words, the piece is 75% pure gold. The remaining 6 parts (25%) are alloy metals added deliberately for strength, durability and colour. The BIS (Bureau of Indian Standards) writes this purity as the three-digit fineness number "750" on hallmarks, so you will see both "18K" and "750" stamped on the same piece.
On the karat scale (where 24K = 100% pure), each karat equals 1/24th or roughly 4.166% gold. So 18K = 18 ÷ 24 = 0.75 = 75%. The BIS hallmarking system uses the corresponding fineness numbers:
| Hallmark Number | Karat | Purity % | Typical Use in India |
|---|---|---|---|
| 999 | 24K | 99.9% | Coins, bars, investment |
| 916 | 22K | 91.6% | Plain jewellery (the standard) |
| 875 | 21K | 87.5% | Some regional jewellery |
| 750 | 18K | 75.0% | ✅ Diamond & studded jewellery |
| 585 | 14K | 58.5% | Cheap / fashion jewellery |
| 375 | 9K | 37.5% | Rare in India — some imported pieces |
2. The 750 Purity Breakdown — Why 25% Alloy?
Genuine 18K gold is 75% pure gold. Unlike 24K (999) gold, which is essentially pure, 18K is deliberately mixed with 25% alloy metals. This is not a cost-cutting trick — it is a technical necessity. Pure 24K gold is so soft that it cannot hold a diamond or gemstone securely; the prongs would bend and the stone would fall out within months. The 25% alloy is what makes 18K suitable for fine jewellery.
| Component | Percentage | What It Is |
|---|---|---|
| Pure Gold (Au) | 75.0% | The precious metal — gives the intrinsic value and warm gold colour |
| Copper (Cu) | ~12.5% | Adds strength and a warm/reddish tint (high in rose gold) |
| Silver (Ag) | ~12.5% | Adds strength and lightens the colour (high in yellow & white gold) |
| Zinc / Palladium | trace | Whitens the alloy for white gold; palladium is nickel-free & hypoallergenic |
3. Why is 18K Gold the Standard for Diamond Jewellery?
The single biggest reason jewellers use 18K for diamonds is strength. A diamond setting — the tiny prongs or bezels that grip the stone — must hold firm for decades of daily wear. Pure 24K gold is too soft; even 22K (916) is borderline for fine prong work. 18K, with its 25% alloy, is hard enough to keep gemstones secure, resist scratching, and hold intricate designs over a lifetime.
✅ 18K (750) — Made for Diamonds
- Hard enough to hold fine prongs securely
- Resists bending, scratching & deformation
- Holds intricate, delicate western designs
- Keeps diamonds & gemstones safe for decades
- The global standard (Cartier, Tiffany, Tanishq)
- Still 75% pure gold — strong resale value
❌ 22K/24K — Wrong for Diamonds
- 22K prongs bend — stones can loosen & fall out
- 24K is far too soft — cannot set stones at all
- Loses shape in delicate filigree work
- Not used by international luxury brands
- 24K is reserved for coins, bars & investment
💡 The Jeweller's Rule: If a piece has diamonds, gemstones, or fine prong/bezel work, it should be 18K (750). If it is plain gold (chains, bangles, rings without stones), 22K (916) is the Indian standard. If it is a coin or bar for investment, 24K (999) is the only correct choice.
4. 18K vs 22K vs 24K — Full Purity Comparison
The BIS hallmarking system recognises several purity grades. Here is how 18K (750) stacks up against 22K (916) and 24K (999), with the approximate price difference at today's rates:
| Hallmark | Karat | Purity | Relative Price | Best For |
|---|---|---|---|---|
| 999 | 24K | 99.9% | Highest (base 24K) | ✅ Investment, coins, bars, SGBs |
| 916 | 22K | 91.6% | ~-8% vs 999 | Plain ornaments (chains, bangles, rings) |
| 875 | 21K | 87.5% | ~-12% vs 999 | Some regional / Gulf-style jewellery |
| 750 | 18K | 75.0% | ~-25% vs 999 | ✅ Diamond & studded jewellery |
| 585 | 14K | 58.5% | ~-41% vs 999 | Cheap / fashion / daily-wear jewellery |
5. 18K Gold Composition — Alloy Metals & Colour Variants
All 18K gold is exactly 75% pure gold. The difference between yellow, rose and white 18K gold lies entirely in the 25% alloy mix. By changing which metals are added, jewellers produce three distinct colours — all genuine 18K (750), all with the same gold value.
| Colour | Alloy Mix (the 25%) | Appearance & Use |
|---|---|---|
| 💛 Yellow Gold | Copper + Silver (roughly equal) | The classic warm gold colour. Traditional choice, pairs well with all skin tones. |
| 🌹 Rose / Pink Gold | More Copper, less Silver | Warm reddish-pink tint. Very popular in modern, bridal & vintage designs. |
| ⚪ White Gold | Palladium, Zinc or Nickel | Silvery-white finish, often rhodium-plated. The standard for premium diamond solitaires. |
6. How to Verify That Your Gold is Really 18K / 750
Because 18K jewellery is more expensive per piece (diamonds, making charges), verifying purity matters even more. Here are the four reliable methods, from quickest to most accurate:
✅ Method 1: Check the BIS Hallmark (30 seconds)
Look inside the jewellery for these marks together:
- BIS logo (a triangle mark) — the official hallmarking stamp
- Purity mark "750" (sometimes written "18K 750")
- Jeweller's identification mark (a registered logo/initials)
- 6-digit HUID (Hallmark Unique Identification) — alphanumeric, unique to each piece
If any of these four marks is missing, the piece is not BIS-hallmarked — do not buy it as 18K.
📱 Method 2: Verify HUID on BIS Care App (2 minutes)
- Download the free BIS Care App (Android / iOS)
- Open the app and tap "Verify HUID"
- Enter the 6-digit HUID stamped on your jewellery
- The app confirms: purity (750 for 18K), jeweller name, and registration validity
- If the HUID is fake, the app shows "not found" — refuse the piece
Read our full BIS Hallmark & HUID Check Guide for step-by-step screenshots.
🔬 Method 3: XRF Machine Test at a Jeweller (Instant & Accurate)
Most reputed jewellers have an X-Ray Fluorescence (XRF) machine that reads the exact purity of any gold piece in seconds without damaging it. Ask them to test your jewellery — a genuine 18K piece will read 74.5–75.5%. If it reads 70% or lower, you have been sold under-karat gold. This test is especially useful when reselling or exchanging old jewellery.
⚖️ Method 4: Density Test (At Home, No Damage)
18K gold has a known density of about 15.2–15.9 g/cm³(lower than 24K's 19.32, because the alloys are lighter than gold). Weigh your jewellery, then measure its volume by water displacement, and divide weight by volume. A genuine 18K piece will measure in this range; fakes or under-karat pieces measure far lower. This is a free, non-destructive sanity check you can do at home.
7. 18K Gold Price — How It Is Calculated & Today's Rate
The price of 18K gold per gram is set each morning by the India Bullion & Jewellers Association (IBJA), based on international gold prices, the USD/INR exchange rate, import duty and GST. Because 18K is only 75% pure gold, its rate is always lower than the 22K and 24K rates — roughly 75% of the 24K rate.
🔥 Quick Price Example
If today's 18K (750) rate is ₹11,242/gram, then:
• 10g of 18K gold value = ₹1,12,420
• 1 Pavan (8g) of 18K gold = ₹89,936
• For jewellery, add making charges (often lower for machine-made 18K diamond pieces) + 3% GST; diamond cost is billed separately
| Weight | 18K (750) Value | 22K (916) Value | Difference |
|---|---|---|---|
| 1 gram | ₹11,242 | ₹13,740 | +₹2,498 (22.2%) |
| 8 grams (1 Pavan) | ₹89,936 | ₹1,09,920 | +₹19,984 (22.2%) |
| 10 grams (1 Tola) | ₹1,12,420 | ₹1,37,400 | +₹24,980 (22.2%) |
| 100 grams | ₹11,24,200 | ₹13,74,000 | +₹2,49,800 (22.2%) |
8. 18K vs 22K Jewellery — Which Should You Buy?
This is the most common decision Indian buyers face. The answer depends on what you will do with the piece. Use this quick decision guide:
| If you are buying… | Choose | Why |
|---|---|---|
| A diamond ring or solitaire | 18K (750) | Hard prongs hold the diamond securely; global standard. |
| Studded / gemstone jewellery | 18K (750) | Alloy strength keeps stones safe over decades. |
| Western-style or modern designs | 18K (750) | Holds fine detail; lighter and more durable. |
| A plain chain, bangle or ring (no stones) | 22K (916) | More gold value (91.6%); traditional Indian standard. |
| Bridal / temple / heavy traditional wear | 22K (916) | Higher purity; better resale for plain gold. |
| Coins or bars for investment | 24K (999) | Purest gold; lowest making charges; best resale. |
9. 7 Smart Tips for Buying 18K Gold Jewellery
- Always insist on the BIS hallmark with "750", the jeweller's mark and a 6-digit HUID — refuse un-hallmarked pieces sold as "18K"
- Verify the HUID on the BIS Care App before paying — it takes 2 minutes and catches fakes instantly
- Ask for an itemised bill showing gold value (at 18K rate), diamond/gemstone cost, making charges and 3% GST separately — refuse a lump-sum quote
- Check today's 18K rate online first, then compare with the jeweller's quoted gold rate — a big gap means hidden charges
- For diamond pieces, check the certification — insist on IGI, GIA or HRD lab certificate for any solitaire above 0.30 carat
- Compare making charges — machine-made 18K designs often charge less than handmade 22K; ask for the % openly
- Buy from reputed jewellers only — Tanishq, Kalyan, Malabar, Joyalukkas, or BIS-registered local jewellers; keep all bills and certificates for resale
10. 6 Costly Mistakes Buyers Make With 18K Gold
- Confusing 18K with 22K — 18K (750) is 75% gold for diamond jewellery; 22K (916) is 91.6% gold for plain jewellery. They are not the same purity, price or use
- Buying "18K" without a hallmark — without the BIS mark and HUID, the purity claim is unprovable; insist on hallmarking or walk away
- Not separating diamond cost from gold cost — a lump-sum bill hides whether you overpaid for the stone or the gold; always ask for an itemised split
- Buying 24K or 22K diamond jewellery — soft gold cannot hold stones securely; genuine diamond jewellery should be 18K, period
- Ignoring the diamond certificate — without an IGI/GIA certificate, a "diamond" may be lab-grown, simulated (CZ), or even glass; always insist on certification for solitaires
- Not getting an itemised bill — without a bill you cannot prove purity, claim buyback, get warranty service, or file a consumer complaint later
Frequently Asked Questions (FAQs)
Q1. What does 18K gold mean?
18K gold means the metal is 75% pure gold and 25% alloy (metals such as copper, silver, zinc or palladium). In the BIS hallmarking system this purity is written as "750" — meaning 750 parts per thousand are pure gold. 18K is the international standard for diamond and studded jewellery because its 25% alloy makes it hard enough to hold gemstones securely while still keeping three-quarters of its value as pure gold.
Q2. What is the meaning of 750 in gold?
750 is the BIS fineness (purity) number for 18-karat gold. It means that out of every 1,000 parts of the metal, 750 parts (75%) are pure gold and the remaining 250 parts (25%) are alloy metals added for strength and colour. So 750 gold = 18K gold. You will see "750" stamped on 18K jewellery alongside the BIS logo and a 6-digit HUID.
Q3. What is the purity percentage of 18K gold?
18K gold is 75% pure gold. The calculation is simple: 18 karat ÷ 24 karat = 0.75 = 75%. The remaining 25% is a mix of alloy metals — typically copper and silver for yellow gold, more copper for rose gold, and palladium or nickel/zinc for white gold. This 25% alloy is what gives 18K its strength and its different colour variants.
Q4. What is the difference between 18K and 22K gold?
18K (750) is 75% pure gold and 25% alloy; 22K (916) is 91.6% pure gold and 8.4% alloy. Because 22K has more gold it is more valuable per gram — roughly 18–20% higher price — and is the standard for plain Indian jewellery (chains, bangles, rings). 18K is harder, holds gemstones and diamonds more securely, and is the standard for diamond/studded and western-style jewellery. For investment, 22K is better; for diamond jewellery, 18K is better.
Q5. What is the difference between 18K and 24K gold?
18K (750) is 75% pure gold; 24K (999) is 99.9% pure gold. 24K is the purest grade and is used for coins, bars and investment because it carries the highest value — but it is too soft for any jewellery. 18K is only three-quarters gold, but its 25% alloy makes it durable enough for everyday diamond jewellery. Per gram, 24K trades roughly 25% higher than 18K at any given rate.
Q6. Is 18K gold good for daily wear?
Yes — 18K gold is excellent for daily wear, especially for diamond rings, engagement rings and studded jewellery. Its 25% alloy content makes it harder and more scratch-resistant than 22K or 24K, so it holds its shape and keeps gemstones secure over years of use. For plain everyday ornaments without stones, 22K is more traditional in India, but for anything with diamonds or fine detail, 18K is the recommended grade.
Q7. Why is 18K gold used for diamond jewellery?
Diamonds need a setting that will not bend or loosen over time, and pure gold (24K) is too soft to hold them — the prongs would deform and the stones would fall out. 18K gold, with its 25% alloy, is strong enough to form tight, durable prongs and bezels that grip diamonds securely for decades. This is why almost all reputable jewellers — Tanishq, Kalyan, Cartier, Tiffany — set diamonds in 18K (750) and not 22K.
Q8. What is the price difference between 18K and 22K gold?
22K (916) gold is roughly 18–20% more expensive per gram than 18K (750) gold because it contains more pure gold. For example, if 22K is ₹7,300/g, 18K is around ₹6,000/g at the same rate. On jewellery the final cost also includes making charges, which are often lower for 18K machine-made diamond jewellery than for handmade 22K ornaments, so the out-of-pocket difference can vary by design.
Q9. How can I check if my gold is really 18K / 750?
Four reliable ways: (1) Look for the BIS hallmark logo with "750" stamped on the jewellery. (2) Find the 6-digit HUID next to the hallmark and verify it free on the BIS Care App — it confirms the purity, jeweller and registration. (3) Ask a jeweller to test it on an XRF machine — a genuine 18K piece reads 74.5–75.5%. (4) Do a density test at home: 18K gold has a density of about 15.2–15.9 g/cm³ (lower than 24K's 19.32).
Q10. Is 18K gold accepted for a gold loan?
Yes. Banks and NBFCs accept 18K (750) gold jewellery for gold loans, though it is valued lower than 22K (916) because it contains less pure gold. The lender tests the purity and calculates the loan amount on the gold's value at the day's 18K rate, capped at 75% LTV (Loan-to-Value) per RBI rules. Note that 24K coins/bars are often NOT accepted for gold loans — only jewellery — so 18K ornaments are actually better than 24K coins if you may need a loan.
Q11. Is 18K gold a good investment?
For pure gold investment (wealth storage), 18K is not the best choice — 24K (999) coins/bars or Sovereign Gold Bonds and Gold ETFs carry more gold value per rupee with lower making charges. 18K is an investment in wearable jewellery: you get durability, diamond settings and a piece you can enjoy wearing, while still holding 75% of its weight in gold that has strong resale value. Buy 18K for jewellery you will wear; buy 24K/SGBs/ETFs for investment.
Q12. What is the resale value of 18K gold jewellery?
18K jewellery retains strong resale value because 75% of its weight is pure gold, which is always recoverable. When selling or exchanging, the jeweller melts the piece, separates the pure gold, and pays you based on the day's 24K rate × 75% of the weight (minus a small melting/refining charge, typically 2–4%). Diamonds and making charges usually fetch less on resale. Expect to recover roughly 60–75% of the original purchase price of a diamond 18K piece, depending on the brand and condition.
Q13. Does 18K gold cause skin allergy or turn black?
Genuine 18K gold rarely causes allergies and does not tarnish or turn black, because it is 75% noble gold. However, some people with severe nickel sensitivity may react to older or cheap white-gold alloys that used nickel. Modern BIS-hallmarked 18K jewellery uses nickel-free alloys (palladium, silver, zinc) and is hypoallergenic. If your "18K" jewellery is turning your skin green or black, it is likely under-karat or fake — real gold does not oxidise.
Q14. What are the colour variants of 18K gold?
18K gold comes in three main colours depending on the alloy mix: (1) Yellow gold — silver + copper in equal measure, the classic warm gold colour. (2) Rose / pink gold — more copper, giving a warm reddish tint popular in modern and bridal designs. (3) White gold — palladium, nickel or zinc, giving a silvery-white finish often rhodium-plated for diamond settings. All three are 75% pure gold; only the 25% alloy differs.
Q15. Is hallmarking mandatory for 18K gold jewellery?
Yes. Since 16 June 2021, BIS hallmarking is mandatory for gold jewellery and artefacts sold in India, and 18K (750) is one of the three officially recognised purity grades (along with 916/22K and 870/21K in some notifications). Any 18K jewellery you buy must carry the BIS logo, the "750" purity mark, the jeweller's mark and a 6-digit HUID. Always insist on a hallmarked piece and an itemised bill.
🔗 Related Guides on WealthMinty
- Compare all purities → 22K vs 24K Gold: Which Should You Buy?
- Jewellery gold explained → What is 916 Gold? 22K Hallmark Guide
- Pure investment gold → What is 999 Gold? 24K Pure Gold Guide
- Verify hallmark → BIS Hallmark & HUID Check Guide
- Calculate jewellery price → How to Calculate Gold Jewellery Price
- Check live prices → Today's Gold Rate in India
- Investment options → SGB vs Physical Gold — Which is Better?
- Gold forecast → Gold Price Forecast 2026
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🎯 The Golden Rule
18K gold is 750-hallmark gold — 75% pure, 25% alloy, and the global standard for diamond and studded jewellery. It is not "less" gold; it is the right gold for gemstones. Always buy BIS-hallmarked 18K with a verifiable HUID, an itemised bill, and a diamond certificate. Buy 18K for diamonds, 22K for plain ornaments, 24K for investment.
💡 The number on your jewellery is not just a stamp — it tells you exactly what you own. Know it, verify it, and never pay for less purity than you were promised.