Pricing Lab-Grown Diamonds: The Floor Keeps Moving
Your input cost has fallen much further than your retail price has. That is excellent for the entry price and dangerous for the story, and it becomes a balance sheet problem the moment you promise a buyback.
- Quote the input price with a named source and a date or not at all. Edahn Golan's LGD Wholesale Price Index was down 13 per cent year on year and 96 per cent since July 2018 as of 7 July 2026, and it moves too fast for a round number to survive a quarter.
- Deflation in your main input moves the customer's anchor without buying you any volume, and it turns unsold stock into a wasting asset. Price the ageing, hold less depth per design, reorder more often.
- A buyback pegged to prevailing rate pushes the price fall onto the customer. One pegged to invoice value pushes it onto your provisions. Ind AS 115 can recast a generous repurchase promise as a financing arrangement.
- IS 19469:2025 puts conflict-free, earth-friendly, pure and nature's outside acceptable terminology for a grown stone, which removes most of the category's usual pitch in one line.
The wholesale price of the stone keeps falling. The retail price does not fall anywhere near as fast. That gap is the commercial case for a laboratory-grown brand, and the thing most likely to break one.
What the input price has actually done
Use named indices with dates, because these figures do not survive a quarter. Edahn Golan’s LGD Wholesale Price Index was down 13 per cent year on year and down 96 per cent since he began tracking wholesale prices in July 2018, published 7 July 2026. In that quarter the movement split hard by size: one carat rounds up 1 per cent, 1.50 to 1.99 carat down 11 per cent, two carat down 20 per cent. JCK reported on 10 August 2026 that wholesale fell 14 per cent year on year in the first quarter of 2026 and 26 per cent across 2025, and that a three carat VVS D round was trading at 126 dollars per carat, 30 per cent below the year before.
Retail has not followed. Paul Zimnisky’s May 2026 retail margin work put retailer markups at more than 80 per cent above wholesale, barely changed from 2025. All of that is United States data. We found no equivalent published Indian index, so treat it as direction, not as your landed cost.
A falling input is not a margin gift
Three things happen when a brand’s main input deflates, and only the first is good.
The entry price improves. A solitaire at a number a first-time buyer will actually pay is why this category grew, a genuine advantage that needs no claim to support it.
The anchor moves with it. A customer who saw your one carat at one price last festive season and a lower price this one has learned that waiting pays. That is the mechanism our note on what discount depth does to contribution margin describes, arriving without a promotion attached. You get repriced by the market instead of by your own decision, which is the worse version, because you collect none of the volume a discount at least buys.
And the stock becomes a wasting asset. On a deflating input, unsold inventory loses value every month it sits, and the loss shows up in carrying cost, not in cost of goods. So price the ageing, not only the piece. Hold less depth per design, reorder more often, and treat slow stone sizes as a provisioning question. The nearest working discipline is not from jewellery. It is refurbished grading and pricing, where price is set against the live price of new stock, not against what you paid.
Why buyback is a different promise on a grown stone
Gold has a published daily rate. That is why exchange works in Indian jewellery: the metal has a floor you do not set. The published exchange terms of the large Indian chains value what is returned at the prevailing rate on the day of exchange, not at what the customer paid. Tanishq’s are a worked example of the wording.
On a natural stone that is already an awkward conversation. On a grown stone it is a different one, because the prevailing rate is set by the cost of growing a new stone, and that cost has fallen for eight straight years. A promise pegged to prevailing rate transfers the whole fall to your customer, and they find out in your store. A promise pegged to invoice value transfers it to you, and you find out in your provisions. There is no third option that quietly absorbs it, and not deciding means your counter staff decide, case by case.
Settle the tax treatment before the policy goes live. Rule 32(5) of the CGST Rules, 2017 lets a dealer in second-hand goods pay GST on the margin between selling and purchase price. The Karnataka Authority for Advance Ruling allowed that for used jewellery resold as such after minor cleaning in Aadhya Gold Private Limited, KAR ADRG 35/2021 dated 9 July 2021, and refused it in White Gold Bullion Private Limited, KAR ADRG 20/2023 dated 15 May 2023, where melting moved the classification from heading 7113 to 7108. Melting ends the margin scheme. Under section 103 of the CGST Act, 2017 an advance ruling binds only the applicant who sought it, so neither is your answer. Both are a map of the argument.
What a buyback commits you to
A buyback is an option you have written and the customer holds. Ind AS 115 treats an obligation to repurchase at the customer’s request as a put option, and the accounting turns on the repurchase price. Below the original selling price, where the customer has no significant economic incentive to exercise, it is accounted for as a sale with a right of return. At or above the original selling price and above the expected market value of the asset, the contract is in substance a financing arrangement. On a stone whose market value falls every quarter, the second case arrives sooner than founders expect.
So write the promise you can honour. Name the percentage, name what it is a percentage of, name the window, name what voids it, and name whether it settles in cash or credit. Credit is a cheaper liability than cash. Lifetime has no expiry and outlives your current price list. The terms are part of your offer, so a buyback described more generously in the advertisement than in the policy is a misleading advertisement question under the Consumer Protection Act, 2019, not a customer service one. Our note on warranty policy and claims applies the same discipline on the service side.
Positioning against natural without a claim you cannot support
The easy pitch is the one you are not allowed to make. IS 19469:2025 puts conflict-free, earth-friendly, pure and nature’s outside acceptable terminology for a grown stone, which deletes most of the category’s standard advertising in one line. An environmental claim also needs evidence you held before you published, which is what our guide to the advertising claim substantiation file exists for. Growth is energy intensive, so that evidence has to be yours and current.
Comparison against natural is allowed. Denigration is not, and naming a rival raises the evidentiary bar rather than lowering it, as our piece on comparative advertising and disparagement sets out. What is left is the boring claim, and it is the only durable one: same material, verified identity, stated origin, this price, this buyback in writing. Every other line in this category gets less true as the input price falls. That one does not.