Two Certifications, One Piece of Jewellery
Most conversations about sustainable jewellery stop at the diamond. Brands talk about conflict-free sourcing, ethical production, and lower environmental impact — all of which matter — but the gold holding that diamond gets almost no scrutiny. That gap is where a lot of buyers get misled.
A genuinely sustainable piece of fine jewellery has two components: the stone and the metal. Skimping on either one undermines the whole claim. In India in 2026, the clearest way to verify both is through two independent certification systems — IGI certification for lab-grown diamonds and BIS hallmarking for gold. Understanding what each actually guarantees, and why you need both, is the most useful thing a Bangalore buyer can know before walking into any jewellery store.
What BIS Hallmarking Actually Guarantees
The Bureau of Indian Standards (BIS) hallmarking system is not a branding exercise. It is the government’s mechanism for verifying that the gold in a piece of jewellery matches the purity stated on the price tag. Without it, that purity figure is simply the seller’s claim — unverified and unenforceable.
Since June 2021, hallmarking has been mandatory for 14K, 18K, and 22K gold jewellery across most of India, and by March 2026, the coverage had expanded to 380 districts nationwide. The March 2026 amendment — the Hallmarking of Gold Jewellery and Gold Artefacts (Amendment) Order, 2026 — extended mandatory coverage further still, making non-hallmarked gold illegal to sell across an even larger part of the country. Selling non-hallmarked gold in covered districts now carries penalties up to five times the cost of the article, or up to one year’s imprisonment for serious violations.
Every BIS-hallmarked piece carries a six-digit alphanumeric HUID — the Hallmark Unique Identification — laser-etched onto the metal. This code connects the piece to a digital record in the BIS database: the jeweller’s name, the gold purity, and the assaying centre that tested it. You can verify it in seconds using the BIS Care app. For 18K gold (750 fineness), the tolerance is plus or minus 3 parts per thousand — a standard consistent with precious metal testing globally.
For buyers in Bangalore, this matters practically. The resale value of hallmarked jewellery is easier to establish because any buyer — whether a jeweller or a private individual — can verify what they’re getting. Jewellery without a hallmark tends to attract lower offers, and sometimes no offer at all.
The Real Environmental Picture of Lab-Grown Diamonds
Lab-grown diamonds are often described as eco-friendly, but that framing probably oversimplifies things. IGI itself notes that most lab-grown diamonds are not fully sustainable, because the energy requirements of CVD and HPHT reactors often rely on fossil fuels. The more accurate statement is that lab-grown diamonds avoid the specific, severe harms of mining — and those harms are significant.
Producing a single carat of mined diamond displaces roughly 250 tons of earth. Mining operations create deforestation, soil erosion, water contamination from chemical runoff, and long-term land degradation that can persist for decades after a mine closes. Mined diamonds consume more than 126 gallons of water per carat; lab-grown diamonds consume around 18 gallons. The carbon footprint of a mined diamond is generally several times higher than that of a lab-grown equivalent, depending on the energy source used in production.
Lab-grown diamonds produced with renewable energy sources — wind, solar, or hydroelectric — come closest to a genuinely low-impact stone. Third-party sustainability certifications, such as those offered through SCS Global Services in collaboration with IGI, allow producers to make verifiable claims rather than vague ones. For buyers who want to go deeper than marketing language, asking about the energy mix used in production is a reasonable question.
But even setting energy source aside, the structural difference remains: lab-grown diamonds bypass large-scale land excavation entirely. No deforestation, no habitat destruction, no displacement of communities near mining sites. That is not a minor distinction.
The India lab-grown diamond jewellery market reflects how quickly buyers have absorbed this logic. The market is valued at approximately USD 453.7 million in 2026 and is projected to grow at a 14.8% CAGR through 2036. In Bangalore specifically, a tech-sector population that tends to evaluate products on evidence rather than tradition has driven some of the fastest adoption in the country.
IGI Certification: What It Verifies and Why It’s Non-Negotiable
An IGI certificate is not a sustainability document — it is a quality document. It verifies the diamond’s cut, clarity, colour, and carat weight through independent assessment, and for lab-grown diamonds specifically, it confirms that the stone was created in a laboratory rather than mined. That confirmation matters for two reasons: it protects the buyer from paying mined-diamond prices for a lab-grown stone (or vice versa), and it provides the paper trail that makes resale and exchange straightforward.
For buyers looking at VVS-EF clarity stones — the top tier of the standard clarity-colour grading scale — an IGI certificate is the only reliable way to verify that the grading is accurate rather than self-reported. In the Indian market in 2026, IGI is the dominant certification standard for lab-grown diamonds, with SGL widely accepted but considered less internationally recognised.
The combination of IGI certification and BIS hallmarking on a single piece creates a level of documentation that simply does not exist with mined diamonds bought from unorganised retail. With a mined stone, the supply chain typically passes through multiple intermediaries, each adding opacity. With a certified lab-grown diamond set in hallmarked gold, both the stone and the metal have been independently verified by institutions with no financial stake in the transaction.
Why the Combination Sets a Different Standard
Plenty of jewellery brands in Bangalore now offer lab-grown diamonds. Fewer ensure that the gold itself is hallmarked to the same standard of verification. And fewer still combine both with policies — lifetime exchange, buyback guarantees, and transparent pricing — that give the certification ongoing practical value rather than just purchase-day assurance.
The reason both certifications matter together comes down to what you are actually buying. A lab-grown diamond set in gold of unverified purity is a certified stone in an uncertified mount. The sustainability and quality claims of the diamond are real, but the gold — which typically represents 40–60% of the material cost of a piece — carries no independent verification. You are trusting the seller’s word on purity, which is exactly the situation BIS hallmarking was designed to eliminate.
For buyers in Jayanagar and across Bangalore shopping for diamond rings, diamond earrings, or a diamond mangalsutra, the practical question is: does this piece have both an IGI certificate for the stone and a BIS hallmark with a verifiable HUID for the gold? If the answer to either is no, the sustainability and quality claims rest on incomplete evidence.
ONYA Diamonds, India’s lab-grown diamond jewellery brand with a strong presence in Bangalore, carries IGI-certified VVS-EF diamonds set in BIS-hallmarked gold across its full range — from solitaire pendants to diamond bracelets. The combination of both certifications, backed by a 100% lifetime exchange policy and 80% buyback guarantee, is what makes the sustainability claim something a buyer can actually act on — not just at the point of purchase, but over the life of the piece.
The broader point stands regardless of where you shop: in 2026, a jewellery brand that talks about sustainability while leaving the gold unverified is telling half a story. The standard worth holding any brand to — in Bangalore or anywhere else — is both certifications, fully documented, on every piece.
