Understanding Gold Purity, Karat & Resale Value — 30 August 2026

Sunday, 30 August 2026 — today let's clear up something almost every buyer asks me at the counter: what karat and purity really mean, and how they decide what your gold is worth when you sell or exchange it. Get this right once and you'll shop with a lot more confidence.

What "karat" actually means

Karat (K) is simply the share of pure gold in the metal, measured in 24 parts. So 24 karat is 24/24 — as pure as gold gets, about 99.9%. Every lower karat mixes in other metals (copper, silver, zinc) to add strength and colour:

• 24K — 99.9% pure (999): the purest form, used mainly for coins and bars. Too soft for everyday jewellery that has to survive daily wear.
• 22K — 91.6% pure (916): the classic choice for Indian gold jewellery — bangles, chains, traditional wedding sets. Rich yellow colour, strong resale demand.
• 18K — 75% pure (750): harder and more durable, ideal for diamond and gemstone jewellery where the metal has to grip stones securely. Comes in yellow, rose and white.
• 14K — 58.5% pure (585): even more durable and lighter on the pocket, popular for everyday diamond pieces and delicate designs.

There's no "best" karat — it depends on the piece. A 22K bangle you'll pass down for generations is a different decision from a 14K pair of diamond earrings you'll wear to the office every week.

How purity is certified: BIS hallmark & HUID

In India, hallmarking of gold jewellery is mandatory in notified districts, and this is your single best protection as a buyer. A genuine BIS hallmark has three things stamped (often laser-etched) on the piece: the BIS logo (the triangle), the purity grade (like 22K916, 18K750 or 14K585), and a six-digit alphanumeric HUID — the Hallmark Unique Identification number that makes every hallmarked piece traceable.

You can verify a HUID yourself through the BIS Care app before you pay. If a piece has no hallmark, or the seller is reluctant to show it, treat that as a warning sign. Hallmarking costs very little and adds real, lasting value — never skip it to save a few rupees.

How purity drives resale & exchange value

Here's the part that surprises people. When you sell or exchange gold, you are paid for the pure gold content in the piece — nothing more. The formula is roughly: weight × purity × the day's gold rate. So a 10-gram 22K chain is valued on 9.16 grams of pure gold; a 10-gram 18K piece on 7.5 grams. That's exactly why higher-karat gold fetches more on resale, gram for gram.

Two things you generally do not get back on resale: the making charges you paid (the craftsmanship cost) and the 3% GST. This isn't a scam — it's how the trade works everywhere — but knowing it upfront changes how you buy. It's the single biggest reason a hallmark matters: without certified purity, a buyer will assume the lowest grade and pay you accordingly.

Making charges, GST & the real "cost of ownership"

Your final bill on any gold piece is broadly: gold value (weight × purity × rate) + making charges + 3% GST. Making charges vary widely — typically anywhere from about 8% to 25%+ of the gold value depending on how intricate the design is (machine-made lightweight chains sit at the lower end; hand-crafted, heavily detailed pieces at the higher end). These are indicative and vary by design and jeweller.

For pieces you buy mainly as a store of value — plain coins, simple chains, classic bangles — keeping making charges low protects your resale. For pieces you buy to wear and love — a diamond pendant, an everyday ring — the design and durability matter more than squeezing the last rupee of resale, and 14K or 18K often makes better sense.

Buying smart, with resale in mind

A few habits I'd suggest to every buyer: always insist on a BIS hallmark and verify the HUID; keep your original invoice, which should clearly state weight, purity and charges (it protects you at exchange time); match the karat to the purpose — higher for value-holding, lower for durable daily wear; and when exchanging old gold, ask exactly how the valuation was calculated. At AT Jewels our exchange valuation is transparent and based on certified purity and the live rate, so you always know how the number was reached.

This weekend's featured pieces

A handpicked set of our 14K diamond pieces — durable everyday gold that grips its stones beautifully, each fully hallmarked. Tap any piece to see it.

14K Rose Gold Diamond Earrings — 0.35ctFrom ₹31,586★★★★★A customer favourite for everyday wear — light, hallmarked rose gold. 14K Rose Gold Diamond Earrings — 0.47ctFrom ₹40,800★★★★★A little more sparkle for festive days, in durable 14K. 14K Yellow Gold Diamond Ring — 0.44ctFrom ₹36,732★★★★★Classic yellow gold that holds its stone securely. 14K Yellow Gold Diamond Pendant — 0.33ctFrom ₹21,850★★★★★A versatile everyday pendant, gifting-friendly. 14K Yellow Gold Diamond Pendant — 0.18ctFrom ₹19,718★★★★★Understated sparkle for daily wear. 14K Rose Gold Diamond Pendant — 0.05ctFrom ₹8,055★★★★★An easy first diamond piece or thoughtful gift.

Why buyers love these: 14K gold is the sweet spot for everyday diamond jewellery — hard enough to protect the stones, kind on the budget, and fully hallmarked so purity is never in doubt. They're the pieces you actually reach for, not the ones that stay locked away.

Frequently asked

What is the difference between 22K and 18K gold?
22K gold is 91.6% pure — richer yellow, softer, and the traditional choice for Indian gold jewellery with strong resale demand. 18K gold is 75% pure — harder and more durable, which is why it's preferred for diamond and gemstone pieces that need the metal to hold stones firmly. Neither is "better"; it depends on the piece and how you'll wear it.

Does lower karat gold have lower resale value?
Yes, gram for gram — because resale pays for the pure gold content. A 22K piece contains more pure gold per gram than an 18K or 14K piece, so it fetches more when sold or exchanged. But durability, design and how much you'll actually wear the piece matter too, so the highest karat isn't always the smartest buy.

How do I check if my gold is genuine in India?
Look for the BIS hallmark: the BIS triangle logo, the purity grade (e.g. 22K916), and the six-digit HUID number. You can verify the HUID in the free BIS Care app. Always keep your original invoice stating weight and purity — it protects you at resale or exchange time.

— Nitin Bardia / AT Jewels