Before you spend Rs 30,000, Rs 80,000, or Rs 2,00,000 on a certified lab-grown diamond piece, there is one set of questions most buyers forget to ask.
What happens after you buy it? What does the jeweller commit to over the lifetime of the piece? If you need to sell it, exchange it, or replace a damaged stone, what are the actual terms?
These are not uncomfortable questions. They are the right questions. A jeweller who is confident in their product answers them clearly and in writing. This guide tells you exactly what to ask and what every answer means.
Why Warranty and Buyback Policy Matters for Lab-Grown Diamond Buyers
The warranty and buyback conversation is more important for lab-grown diamond jewellery than for almost any other consumer purchase in India. Diamond jewellery sits at the intersection of emotional purchase and financial investment. The after-sales commitment of the retailer determines how the financial dimension of that purchase holds up over time.
For lab-grown diamonds specifically, the buyback question carries additional weight because the category is newer than mined diamonds and buyers rightly want clarity on long-term value. A retailer with a clear, written buyback policy is demonstrating confidence in the product they sell. A retailer who is vague about buyback terms is telling you something important about their confidence in the product.
The Five Policy Elements You Must Clarify Before Buying
1. Buyback Percentage: Cash vs Exchange
Every buyback policy has two components: the cash buyback percentage and the exchange credit percentage. These are almost always different.
Cash buyback means the jeweller buys the piece from you for a stated percentage of the original purchase price and gives you money. A strong cash buyback policy offers 80 to 100 percent of the purchase price in cash.
Exchange credit means the jeweller gives you credit toward a new purchase at a stated percentage of the original price. Exchange credit percentages are typically higher than cash percentages, often 100 percent or more.
Goenka Jewellers offers 100 percent buyback on all lab-grown diamond jewellery. Always ask which applies to your specific piece.
Be cautious of any policy that states the buyback percentage without clarifying whether it applies to the diamond component only, the full piece including gold, or only under specific conditions.
2. Valuation Method: Who Decides the Resale Value?
The buyback percentage is only meaningful if the valuation basis is clear. Some retailers offer a stated percentage but base it on the current market valuation of the piece rather than the original purchase price.
The strongest policies state: buyback at X percent of original purchase price, retaining proof of purchase. Always keep your purchase receipt and IGI certificate together as the documentation for any future buyback or exchange claim.
3. Free Servicing Period and Lifetime Maintenance
A quality jeweller commits to after-sales service that maintains the piece in the condition in which it was sold. This includes: free prong inspection and re-tipping within a defined period, rhodium replating for white gold pieces, clasp and chain repair, and professional cleaning.
The minimum acceptable free service period is one year from purchase.
Goenka Jewellers provides ongoing professional maintenance for all purchased pieces. Contact either the Kolkata or Delhi store to arrange a professional inspection and clean for any piece.
4. Stone Loss or Damage Policy
What happens if a stone falls out of its setting? The two relevant questions are: does the jeweller cover stone replacement for manufacturing defects in the setting, and what is the cost of stone replacement for accidental loss?
A manufacturing defect means the setting was inadequate from the point of manufacture and the stone loss is the jeweller's responsibility. Accidental loss is typically the owner's responsibility.
A responsible jeweller makes this distinction clearly and provides written clarity on which scenario their policy covers.
5. Certificate Transfer and Verification
The IGI certificate that accompanies your piece is the key document for any future buyback, exchange, or insurance claim. Confirm that the certificate number matches the piece you are purchasing at the point of sale. The report number is laser-inscribed on the girdle of most certified diamonds and can be verified on the IGI website.
Red Flags: Policies That Should Give You Pause
Verbal buyback commitments with no written policy. If a jeweller says they offer buyback but cannot show you the written terms, that commitment is not enforceable.
Buyback policies limited to a short window. A buyback policy that only applies within six to twelve months of purchase is not a meaningful long-term commitment.
Policies that apply only to exchange, not cash. Exchange-only policies lock your investment into the specific retailer without giving you the option of realising its value as cash.
Policies that exclude the gold component. Always confirm whether the buyback applies to the full piece or only to the stone.
No mention of certification at the point of buyback. A serious retailer verifies the IGI certificate at the point of buyback.
Understanding Lab-Grown Diamond Resale Value in India 2026
Lab-grown diamond prices in India have declined significantly since 2020 as production technology has become more efficient and supply has increased. This is a known and acknowledged characteristic of the category. Buyers should enter the purchase with accurate expectations.
Lab-grown diamonds are purchased for their beauty, their quality, and the experience of owning certified fine jewellery. They are not purchased as appreciating investments.
The gold component of a lab-grown diamond piece does hold and appreciate with gold market prices. The diamond component reflects lab-grown diamond market conditions at the time of any future valuation.
A 100 percent buyback policy at original purchase price, as offered by Goenka Jewellers, is meaningful precisely because it insulates the buyer from market price movements in the diamond component for any exchange or return scenario.
Frequently Asked Questions
What is the difference between a warranty and a buyback policy for diamond jewellery?
A warranty covers defects in the piece itself: manufacturing faults, prong failures, setting issues. A buyback policy covers what happens if you want to sell or exchange the piece in the future. Both matter and both should be clarified before purchase.
Can I sell my lab-grown diamond jewellery to a different retailer?
Yes, but the terms will differ from the selling retailer's own buyback policy. The original retailer's buyback policy typically offers better terms because they are committed to their own product.
Is the IGI certificate sufficient for insurance purposes?
The IGI certificate provides documentation of what was purchased. For insurance purposes, most Indian insurers also require a purchase receipt and in some cases an independent valuation letter from a registered valuer. Contact your insurer directly to confirm what documentation they require.
Does Goenka Jewellers accept lab-grown diamond pieces purchased elsewhere for exchange?
Contact Goenka Jewellers directly at either the Kolkata or Delhi store to discuss exchange options for pieces purchased elsewhere. Terms depend on the certification, condition, and current market valuation of the specific piece.
The Bottom Line
The warranty and buyback policy of the retailer you buy from is as important as the quality of the piece itself. Ask the questions before you buy. Get the answers in writing. Keep your certificate and receipt permanently. Choose a retailer whose confidence in their product is demonstrated by the strength of their after-sales commitment.
For guidance on verifying your diamond's certification, read our IGI Certified Lab-Grown Diamonds: Why Certification Matters in India. For the complete buying framework, read our How to Buy Diamond Jewellery Online Safely in India: A 10-Point Checklist. Then explore the complete certified lab-grown diamond collection at Goenka Jewellers.