Gold Alloy Composition and Loan Value: How Purity Sets Your Loan
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Two bangles can weigh exactly the same and fetch very different loan amounts. The reason sits inside the metal. Almost no jewellery is pure gold. It is an alloy, gold mixed with copper, silver or zinc for strength, and the share of actual gold in that mix decides what a lender will offer. This guide explains gold alloy composition and loan value in plain terms: what the carat numbers really mean, how lenders test and convert purity to a 22-carat benchmark, and which parts of your jewellery add nothing to the loan. A Gold Loan from IIFL Finance values the gold content transparently.
What Is a Gold Alloy? A Quick Primer
Pure gold, 24 carat, is soft. Soft enough to bend with firm fingers, which makes it a poor material for a bangle worn daily. So jewellers mix it with harder metals, usually copper, silver or zinc, to make it durable and workable. That mix is an alloy. The carat number simply tells you the gold's share of the mix, measured in twenty-fourths. The higher the carat, the more gold, the softer the piece, and the higher its metal value.
Common Gold Alloy Compositions in Indian Jewellery
Most Indian jewellery sits in a narrow band of purities, and each has its character. Here is the map:
|
Carat |
Gold content |
Typical use |
|
24K (999) |
99.9% |
Coins and bars, too soft for jewellery |
|
22K (916) |
91.6% |
Traditional Indian jewellery, the standard |
|
18K (750) |
75% |
Studded and diamond jewellery, daily wear |
|
14K (585) |
58.5% |
Lightweight and modern designs |
Note: All figures are indicative. Actual amounts, fees, coverage percentages, and eligibility criteria may vary depending on the lender, borrower profile, loan category, and applicable guidelines at the time of application.
The mixing metal changes the colour too. More copper gives rose gold its warmth. Silver and zinc push towards paler yellow, and white gold uses metals like palladium with a rhodium coat. Colour is style. The carat is money. A hallmark, the BIS stamp with the purity number, tells you the official composition at a glance, and hallmarked pieces make valuation quicker because the purity is already certified.
How Gold Alloy Composition Affects Your Loan Value
Here is the part that matters at the branch. A lender does not pay for the whole bangle. It pays for the gold inside it. When you pledge jewellery, the assayer tests its actual purity and works out the net gold content. Under the RBI's 2026 framework, that content is then valued against a 22-carat benchmark: the price used is the lower of the 30-day average or the previous day's closing rate from a recognised body like the India Bullion and Jewellers Association (IBJA), and lower-purity gold is converted to its 22-carat equivalent weight first. Take a practical case. A 20-gram 18K chain contains 15 grams of pure gold, which converts to roughly 16.4 grams of 22K equivalent. That converted figure, at the benchmark rate, is your gold value, and the LTV tier then applies on top, 85% for loans up to INR 2.5 lakh, 80% up to INR 5 lakh, 75% above. So the same 20 grams fetches more as 22K than as 18K, purely because more of it is gold. The weight on the receipt matters less than the carat behind it. You must be present for the assaying, and the certificate you receive lists the purity, weights and every deduction, so the arithmetic is open.
Why Lenders Test Alloy Composition Every Time
Because stamps can lie and memories can flatter. A piece bought as 22K decades ago may test lower, and unhallmarked jewellery carries no guarantee at all. The rules require lenders to run a uniform assaying procedure on every pledge, in your presence, rather than trusting a stamp. It protects both sides: you get a value based on what the metal actually is, and the lender lends against reality, not a label.
Alloy Metals That Do Not Add Loan Value
This is where expectations most often slip. The copper, silver or zinc in the alloy contributes nothing to the loan value. Neither do stones, however precious they looked at purchase, nor pearls, beads, lac filling inside hollow ornaments, strings, or clasps and fastenings of other metal. All of it is weighed and deducted before the gold value is struck, and each deduction must be itemised on your certificate. A heavily studded 18K necklace can therefore surprise its owner: the gross weight reads high, but the net gold is modest. If your goal is maximum loan per gram, plain, high-carat pieces do the job better than ornate, stone-set ones. The craftsmanship you paid for as making charges is real money spent, but it is not money a lender can recover from metal, so it does not count.
Conclusion
The carat number quietly runs the whole gold loan calculation. More gold in the alloy means more value per gram, the 22-carat IBJA benchmark converts everything to a common standard, and stones and fittings fall away as deductions. Know your jewellery's purity before you visit a branch and the offer will not surprise you. A Gold Loan from IIFL Finance assays your gold in front of you and puts the full working on your certificate.
Frequently Asked Questions
Which gold purity gets the highest loan value?
Gram for gram, higher carat wins. A 22K piece carries 91.6% gold against 75% in an 18K piece, so the same weight of 22K jewellery converts to more 22-carat-equivalent gold and a larger loan. 24K is purer still but rarely exists as jewellery, mostly as coins, and only bank-issued coins qualify as pledge. In practice, plain 22K ornaments are the strongest collateral most households hold, since nearly all their weight is actual gold.
How do lenders test my jewellery's alloy composition?
Through a standard assaying procedure carried out in your presence, using methods such as touchstone testing and electronic purity machines like XRF analysers, which read the gold percentage without damaging the piece. The rules require uniform testing on every pledge rather than reliance on stamps. After testing, the lender issues a certificate listing the purity in carats, gross and net weight, and each deduction, so you can see exactly how the assessed value was reached before you accept the offer.
Do stones and fittings in my jewellery add to the loan amount?
No. Stones, pearls, beads, lac filling, strings and non-gold clasps are all deducted from the weight before valuation, whatever they cost at purchase. Only the net gold content earns a loan value. Each deduction must be itemised on your assaying certificate, so nothing disappears silently. This is why an ornate studded necklace often supports a smaller loan than a plain chain of the same gross weight, and why plain high-carat pieces are the most efficient jewellery to pledge.
Is hallmarked jewellery valued higher for a gold loan?
Hallmarking does not add value by itself, but it removes doubt. The BIS stamp certifies the purity, so a hallmarked 22K piece is quickly confirmed at 91.6% gold, while an unhallmarked piece depends wholly on the assayer's test and may turn out lower than the family believed. The loan value ultimately rests on tested purity either way. Hallmarked pieces simply tend to sail through valuation with fewer surprises, which makes the process smoother and the offer more predictable.
Why did my 20-gram chain get a smaller loan than my neighbour's?
Almost certainly the alloy. If your chain is 18K and the neighbour's is 22K, yours holds 15 grams of pure gold against their 18.3 grams, a gap of over 20% before the loan maths even starts. Stones, lac or heavy clasps widen the difference further through deductions. Both loans use the same IBJA-linked benchmark and LTV tiers, so the rules are identical. The metal is not. The carat behind the weight, not the weight alone, decides the offer.
Disclaimer : The information in this blog is for general purposes only and may change without notice. It does not constitute legal, tax, or financial advice. Readers should seek professional guidance and make decisions at their own discretion. IIFL Finance is not liable for any reliance on this content. Read more
