Swiss Gold Gem and Jewellery (Pvt) Ltd — How Gold Purity is Measured: Understanding 24K, 22K, 18K Gold - Registered Gold, Silver & Gem Dealers Sri Lanka

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Gold is beautiful, timeless, and valuable but not all gold is the same. When you come to sell gold, whether a family heirloom, a broken bracelet, or an old coin, understanding gold purity is the single most important thing that determines how much you’ll get paid. In this friendly, in-depth guide we’ll walk you through everything: what karats mean, how purity is measured, why 24K, 22K and 18K behave differently, how buyers test gold, and practical tips for anyone who wants to sell gold in Colombo especially if you’re thinking of selling to Swiss Gold Gem and Jewellery.

This article is tailored to help you confidently sell or value your gold, with clear, SEO-friendly guidance for customers searching to Sell Gold at Swiss Gold Gem and Jewellery (Pvt) Ltd or who want to find the Best gold buyer Colombo.

Quick summary (if you’re in a hurry)

24K gold = pure gold (virtually no alloy) → highest purity and highest price per gram.
22K gold = 22 parts gold out of 24 (≈91.7% gold) → very common for jewellery in Sri Lanka.
18K gold = 18 parts gold out of 24 (75% gold) → durable, used in higher-end designs.
Gold purity is measured in karats (K) or fineness (parts per thousand), and verified using tests like XRF, acid, electronic testers, and hallmark checks.
If you plan to sell gold in Colombo at Swiss Gold Gem and Jewellery (Pvt) Ltd, remember: All appointments have to be prior book as we attend to pre bookings only at any of locations. Book online or call to secure your appointment.

What “Karat” (K) means — the simple logic

“Karat” (abbreviated K) tells you how much pure gold is present in an alloy. The system is base-24.

24K = 24/24 parts gold = 100% pure gold (often described as 99.9% or 99.99% refined).
22K = 22/24 ≈ 91.7% gold and 8.3% alloy (silver, copper, or other metals).
18K = 18/24 = 75% gold and 25% alloy.

Every time you see a karat mark inside a ring, bangle, or pendant, that number means the above. The higher the karat, the higher the gold content — and usually, the higher the price per gram.

Fineness vs Karat: two ways to describe the same thing

Some markets use fineness instead of karat. Fineness is parts per thousand:

24K = 999 or 999.9 fineness (near 1000/1000 gold).
22K = 917 fineness (≈917/1000).
18K = 750 fineness (750/1000).

When you read a certificate or a hallmark, you may see either system — they both describe purity.

Why jewellery is alloyed (why pure gold isn’t always ideal)

Pure gold (24K) is soft and easily scratched or bent. To make jewellery durable and wearable, metals like copper, silver, nickel, or palladium are mixed in:

22K is common when you want high gold content but some strength — typical for traditional Sri Lankan jewellery.
18K is preferred for pieces with gemstones or delicate modern designs because it’s stronger and holds stones more securely.
Another reason to alloy gold is to change color: more copper → warmer/richer yellow or rose gold; more nickel/palladium → paler white gold.

So purity isn’t the only factor — design, durability, and color preferences determine the karat used.

How karat affects value: what buyers consider

When you sell gold, buyers look at:

Net weight (grams) — the weight of the actual gold-containing item.
Purity (karat or fineness) — higher purity = more gold content.
Current gold rate per gram for that purity (market price fluctuates daily).
Labor or making charges — some jewellery still carries collectible or designer value beyond melt price.
Condition and market demand — very collectible or branded pieces can fetch more.

Example (simplified): if the gold rate for 24K is X LKR per gram, then 22K will be roughly 0.917 × X per gram (before buyer spread, taxes, or fees). A trusted buyer will clearly show the calculation and pay you accordingly.

Common gold purities you’ll see in Sri Lanka

24K (999 / 99.9%) — often used for investment bars, coins, and certain high-end ornaments.
22K (917 / 91.7%) — very common for traditional wedding jewellery and local pieces.
18K (750 / 75%) — used in modern and gem-set jewellery.
14K and lower — rarer locally, more common in exported pieces or certain fashion lines.

How professional buyers measure gold purity (testing methods)

Reputable buyers use several testing methods together to be accurate and transparent:

1. XRF (X-ray fluorescence)

What it does: Non-destructive test that shows elemental composition right away.
Why it’s used: Fast, accurate, and doesn’t need to damage the item. Great for karat confirmation.
Limitations: Surface plating or heavy surface treatments can influence results slightly — professionals account for this.

2. Electronic gold testers

What they do: Measure electrical conductivity and estimate karat.
Why used: Quick and portable — common in retail outlets.
Limitations: Not as definitive as XRF; best used with visual inspection.

3. Acid test (touchstone)

What it does: A small scratch on a touchstone with acid drops shows reaction according to karat.
Why used: Cheap, traditional, effective for simple checks.
Limitations: Slightly destructive (surface scratch), less popular now where XRF is available.

4. Fire assay (assay lab)

What it does: Melts the metal and chemically tests the exact gold content.
Why used: Most accurate — often used in refining or when very precise valuation needed.
Limitations: Destructive and time-consuming; not used for routine retail checks.

5. Hallmark & certificates

What it does: Hallmarking from an accredited body certifies purity.
Why used: Hallmarks (and GIA / gem reports for gems) give confidence and can increase resale value.

At Swiss Gold Gem and Jewellery (Pvt) Ltd, we use professional testing to ensure you get a fair, transparent value for your gold — and we explain every step.

What to expect when you come to sell gold in Colombo

If you want to Sell Gold in Colombo at Swiss Gold Gem and Jewellery (Pvt) Ltd, here’s the typical transparent workflow:

Pre-book your appointment (All appointments have to be prior book as we attend to pre bookings only at any of locations.)
You’re greeted by a trained appraiser.
Visual inspection & hallmark check.
Purity testing (XRF / electronic / touchstone as appropriate).
Weight measured on calibrated scales (we show you the reading).
Price calculation shown clearly: gold rate × purity × weight, minus agreed margin (if any).
If you accept, payment is made instantly (cash or bank transfer) and paperwork completed.

We encourage customers to pre book through the website or by giving a call to ensure a private, fast appointment that respects your time and privacy.

Tips to get the best price when selling gold

Know the karat: If you know your piece is 22K, you’ll have a clear expectation.
Bring documentation: Certificates, receipts, and hallmark proof can increase buyer confidence.
Clean gently: Remove dirt or grime — but don’t over-polish antique pieces that require professional handling.
Shop local trusted buyers: Reputation matters — compare offers from trusted stores.
Ask for full transparency: Ask the buyer to show calculations and tests.
Pre-book your visit: As noted, All appointments have to be prior book as we attend to pre bookings only at any of locations. Booking ensures a dedicated appraiser and no waiting.

Why choose Swiss Gold Gem and Jewellery (Pvt) Ltd to sell your gold

Looking for the Swiss Gold Gem and Jewellery (Pvt) Ltd – Best gold buyer Colombo? Here’s why many customers choose us:

Professional testing — we use modern XRF and calibrated scales.
Transparent pricing — we explain calculations and show live rates.
Multiple convenient outlets across Colombo & suburbs so you can choose the nearest branch.
Experienced staff — trained appraisers knowledgeable about karats, hallmarking, and gem settings.
Secure and private appointments — All appointments have to be prior book as we attend to pre bookings only at any of locations.
Instant payouts — get paid on the spot by cash or bank transfer.

If you want to Sell Gold at Swiss Gold Gem and Jewellery (Pvt) Ltd, please pre-book via the website or call ahead so a specialist will be ready for you.

Our outlets (visit by appointment)

We serve customers at multiple safe, central locations. Please pre-book your appointment before coming.

World Trade Centre (East Tower) – Level 26
Level 26, East Tower, World Trade Centre
Echelon Square, 00100 Colombo, Sri Lanka
Parkland Building – Level 12, Park Street
Parkland Building – Colombo
Level 12, No. 33 Park Street
00200 Colombo, Sri Lanka
McLaren’s Building – 2nd Floor
McLaren’s Building – Colombo
2nd Floor, No. 123 Bauddhaloka Mawatha
Colombo 4, Sri Lanka
Bernards Business Park – 2nd Floor
Bernards Business Park – Dehiwela
2nd Floor, No. 106 Dutugemunu Street
Dehiwela, Sri Lanka
Rajagiriya Branch – No.234/4
Rajagiriya – Colombo
No. 234/4, 1F & 2F, Sri Jayawardhanapura Mawatha
10100 Rajagiriya, Sri Lanka
Nawala (Main Location) – Level 4, No.192/10
Main Location — Swiss Gold Gem & Jewellery (Pvt) Ltd
Level 4, No. 192/10, 9th Lane, Nawala Road
10250 Kotte, Sri Lanka

Please remember: All appointments have to be prior book as we attend to pre bookings only at any of locations. Pre-book through our website or call the branch you plan to visit — this guarantees a private, dedicated appointment with a specialist.

Frequently Asked Questions (FAQ)

Q: How much will I get paid for 22K gold?
A: Payment depends on weight, purity (22K = 91.7%), and current 24K gold rates. A transparent buyer shows the math: (24K rate × 0.917) × weight. Swiss Gold Gem and Jewellery (Pvt) Ltd explains this calculation at your appointment.

Q: Do I need to bring ID or documents?
A: Yes — please bring a valid ID for KYC and, if you have certification or receipts for the jewellery, bring those too. Documentation speeds up the process and can help establish provenance for rare or branded pieces.

Q: Can I sell broken jewellery or items with gemstones?
A: Yes — buyers evaluate gold content separately from gemstone value. Gem-set items may be assessed differently; Swiss Gold Gem and Jewellery (Pvt) Ltd offers gem appraisal and will advise whether the gems increase the offer.

Q: Is the testing safe for my jewellery?
A: Most modern tests (XRF, electronic) are non-destructive. Touchstone/acids may leave minor surface marks; these are only used if necessary. Our policy is to prefer non-destructive methods and to explain all steps.

Q: Can I negotiate prices?
A: Reputable buyers use market rates and transparent margins. You’re welcome to ask questions and compare offers. Pre-booking ensures a calm environment to review offers and paperwork.

Checklist before you sell

Clean but don’t over-polish or alter antiques.
Gather any certificates, bills or hallmarks.
Decide if you need cash or bank transfer.
Pre-book your appointment online or by call. (All appointments have to be prior book as we attend to pre bookings only at any of locations.)
Bring valid photo ID.

Final thoughts — sell with confidence

Understanding gold purity, the difference between 24K, 22K and 18K, empowers you to make informed decisions. Whether you’re selling because you need cash, downsizing a collection, or passing on family pieces, transparency matters: purity test results, clear math, and reputability of the buyer.

If you’re ready to Sell Gold in Colombo at Swiss Gold Gem and Jewellery (Pvt) Ltd, we make the process simple, private, and fair. Pre-book your appointment through our website or give us a call at your preferred branch so a specialist is ready when you arrive. We look forward to helping you get the best value for your gold.

Disclaimer:
The information provided in this article is for general informational and educational purposes only and does not constitute financial, legal, or professional advice. While every effort has been made to ensure accuracy at the time of publication, gold prices, market conditions, regulations, and valuation methods may change without notice. Readers are advised to conduct their own research and seek independent professional advice where necessary before making any decision to sell gold or other valuables. Swiss Gold Gem and Jewellery (Pvt) Ltd does not guarantee specific prices, offers, or outcomes mentioned in this article, as all valuations are subject to in-person assessment based on purity, weight, market rates, and applicable terms. Availability of services, payment methods, and operational procedures may vary by location and are subject to prior appointment requirements. By using this information, you acknowledge that any actions taken are at your own discretion and risk.