Lab-Grown Diamond Wholesale Prices Rose in Q3 2026: What the First Quarterly Gain in Years Means for Indian Buyers Budgeting Now

Lab-grown diamond wholesale prices increased by approximately 2% quarter-on-quarter in Q3 2026, marking the first broad quarterly gain since analyst Edahn Golan began publishing his wholesale price index in July 2018 — a milestone that has sent ripples through the Indian manufacturing hubs of Surat and Mumbai, and is now relevant to every Indian buyer trying to time a purchase.

The gain is real but narrow. The Lab-Grown Diamond Wholesale Price Index still sits 93% below its July 2018 starting point and 15% below Q3 2025. What changed in Q3 is the direction of travel, not the destination — and for Indian buyers who have been watching prices fall for years, understanding what that shift means in rupee terms is now a practical budgeting question.

Q3 2026 Wholesale Price Snapshot: Size-by-Size Breakdown

The table below draws directly from the Q3 2026 Lab-Grown Diamond Wholesale Price List published by Edahn Golan Diamond Research & Data. Prices track IGI-certified, well-made round stones traded in cash transactions in Mumbai and Surat — the centres of India's lab-grown polished diamond trade.

Size	Color	VVS ($/ct)	VS ($/ct)	QoQ Change	YoY Change
1 ct	D	$87	$82	+1.3%	~−9%
1 ct	E–F	$85	$81	+1.3%	~−9%
1 ct	G–H	$79	$76	+1.3%	~−9%
1.50 ct	D	$96	$88	−3.0%	—
1.50 ct	G–H	$73	$73	−3.0%	—
2 ct	D	$120	$91	+2.3%	−20%
2 ct	G–H	$76	$75	+2.3%	−20%
3 ct	D	$142	$129	+7.5%	—
3 ct	G–H	$79	$78	+7.5%	—

Source: Edahn Golan LGD Wholesale Price List, Q3 2026. Prices are US dollars per carat for IGI-certified rounds, wholesale transactions in India. Fancy and square shapes recorded gains of more than 7.5% quarter-on-quarter.

Three observations stand out. First, the 3-carat D-color VVS stone at $142 per carat is the most expensive tracked grade — and it remains extraordinarily cheap by any historical standard. Second, the 1.50-carat category is the only size that declined quarter-on-quarter (−3%), suggesting the recovery is uneven rather than a clean market-wide floor. Third, the 2-carat round is down 20% year-on-year even as it gained 2.3% on the quarter — a reminder that the quarterly uptick is a small correction within a much larger long-term decline.

What Does "First Quarterly Gain in Years" Actually Mean?

The Lab-Grown Diamond Wholesale Price Index is defined as the composite average of wholesale transaction prices across tracked sizes, colors, and clarities of IGI-certified lab-grown diamonds, published quarterly by Edahn Golan Diamond Research & Data since July 2018. That index has fallen in virtually every quarter since its inception.

In Q1 2026, midstream prices fell another 14% year-over-year, with a three-carat VVS D-color round priced at just $126 per carat — 30% cheaper than in 2025. By Q2 2026, the rate of decline had slowed to 13% year-over-year, and the wholesale index had fallen 96% since 2018. The Q3 2026 data — showing a 2% quarterly gain and an index now described as 93% below its starting point — reflects both the uptick and a slight methodological recalibration in how the index is composed.

The significance is not that prices are recovering to anything resembling their 2018 levels. They are not. What matters is that for the first time, the data suggests the market may be approaching what economists call a price floor — the level below which further declines become structurally difficult because producers cannot profitably supply at lower prices.

Whether that floor holds is a separate question, addressed below.

Why Did Prices Rise in Q3 2026?

Three forces appear to have converged in Q3 2026 to produce the quarterly gain.

Demand acceleration in the United States. US unit sales of jewelry set with lab-grown diamonds increased 25% in September 2026, with year-to-date demand up nearly 23%, according to Tenoris data. That pace of demand growth, sustained over multiple quarters, has begun to absorb inventory that had been piling up in the midstream. In Q2 2026, the ratio of lab-grown inventory to sales at US jewelry retailers had climbed to nearly 50% — a figure that Edahn Golan described as a structural imbalance with potential for a damaging bullwhip effect. Demand growth at 23–25% is the most direct antidote to that imbalance.

Supply-side discipline among growers. Some lab-grown diamond growers have begun holding rough prices steady or raising them after years of declines. In China, producers raised prices by at least 30%, while Diamond Foundry reportedly raised prices by about 25% in the period leading into Q3. Edahn Golan characterised these increases as "opportunistic moves in a consolidating market rather than a response to consumer demand" — but opportunistic or not, they reduced the volume of cheap rough entering the polishing pipeline, which tightened supply of finished goods.

Consolidation among Indian manufacturers. Consolidation and greater vertical integration among Indian manufacturers in Surat and Mumbai may also be helping align production with downstream demand. Smaller, less-capitalised manufacturers who were cutting prices to move inventory have been squeezed out or absorbed, leaving a more disciplined set of suppliers setting the market price.

None of these factors is guaranteed to persist. The Q3 gain is best understood as a signal, not a confirmation.

Is This a Price Floor, or a Temporary Bounce?

This is the question every Indian buyer is implicitly asking when they decide whether to buy now or wait.

The data does not yet confirm a floor. The recovery is uneven, and substantial year-over-year declines persist. The 1.50-carat category declined 3% on the quarter even as other sizes rose. Two-carat rounds are still 20% below Q3 2025 despite their quarterly gain. Fancy shapes gained more than 7.5% on the quarter but remain 9.5% below a year ago.

What the data does support is that the conditions for stabilisation are emerging. Demand is growing at double-digit rates. Some producers are exercising pricing discipline. The rate of year-over-year decline has decelerated from 26% in full-year 2025, to 14% in Q1 2026, to 13% in Q2 2026, to 15% in Q3 2026 — with the quarterly direction now positive. That deceleration pattern is consistent with a market approaching a floor, even if it has not definitively reached one.

For Indian buyers, the practical implication is this: the window of historically low prices is likely narrowing, but it has not closed. A buyer who waits for absolute certainty of a floor may find that the floor was Q3 2026 — or they may find that Q4 2026 or Q1 2027 offers another dip. The data does not resolve that uncertainty.

What Do These Wholesale Prices Mean for Indian Retail Buyers?

Lab-grown diamond wholesale price is defined as the cash transaction price at which IGI-certified polished stones change hands between businesses in the Indian midstream — primarily between manufacturers and traders in Mumbai and Surat. Retail prices paid by Indian consumers are a separate, higher figure.

The gap between wholesale and retail is substantial. In Q2 2025, US retailers paid an average of $191 per carat for a round, 1-carat, IGI-certified lab-grown diamond — about twice the wholesale trading price for the same stone. Indian retail markups follow a different structure (influenced by GST, import/export dynamics for settings, and retailer margin expectations), but the principle is the same: wholesale prices are the floor of the supply chain, not the price a consumer pays.

That said, wholesale prices are the most reliable leading indicator of where retail prices are heading. When wholesale prices rose 2% in Q3 2026, that did not mean Indian retail prices immediately rose 2%. Retailers absorb margin changes gradually. But if wholesale prices continue to firm through Q4 2026 and into 2027, Indian retail prices will follow — with a lag of one to three quarters.

Paul Zimnisky's retail margin analysis for 2026 shows that US retailers are managing markups of more than 80% above wholesale, a figure that has barely moved between 2025 and 2026. Indian retailers operate in a different competitive environment, but the structural point holds: retailers have been capturing the benefit of falling wholesale prices rather than passing all of it to consumers. As wholesale prices stabilise or rise, that buffer shrinks.

For an Indian buyer with a fixed budget — say, ₹3–5 lakh (roughly $3,600–$6,000 at current exchange rates) — the current wholesale price environment still supports purchases that would have been impossible three years ago. The average retail price of a one-carat round lab-grown diamond declined 79% to $768 between January 2020 and May 2026, per Tenoris data. That structural affordability does not reverse overnight even if wholesale prices have found a floor.

How Does the Q3 2026 Data Affect Different Carat Sizes for Indian Buyers?

The Q3 2026 price movements are not uniform across sizes, and the implications for Indian buyers differ depending on what they are shopping for.

1-carat buyers saw the smallest quarterly gain (+1.3%) and the most stable recent trajectory. The 1-carat category is where demand has been most consistent, and wholesale prices for 1-carat rounds actually rose 1% year-over-year in Q2 2026 — an anomaly in a market where every other size was still declining. For Indian buyers targeting a 1-carat stone, the price environment is already relatively stable, and the Q3 data reinforces that stability. Waiting is unlikely to yield meaningful savings.

1.5-carat buyers face the most ambiguous signal. The 1.50-carat category was the only size to decline in Q3 (−3%), suggesting it has not yet found its floor. Buyers with flexibility on timing may find Q4 2026 or Q1 2027 offers a marginally better price for this size. The year-over-year decline for this category has also been among the steepest, though, so the absolute price level is already very low.

2-carat buyers are in an interesting position. The 2-carat round gained 2.3% on the quarter but remains 20% below Q3 2025. That year-over-year gap means buyers who have been watching prices fall for the past year are still getting a substantially better deal than they would have a year ago, even with the quarterly uptick. If the quarterly gains persist into Q4 2026, the year-over-year gap will begin to close — making now a more attractive entry point than six months from now.

3-carat buyers saw the strongest quarterly gain (+7.5%), which is notable because 3-carat stones had also seen the steepest year-over-year declines in 2025 (−32% for the full year). That 7.5% quarterly recovery, combined with data showing demand for exact 3-carat stones nearly doubling year-on-year at some retailers, suggests this size may be the first to see sustained price recovery. Indian buyers targeting a 3-carat stone have the strongest case for acting sooner rather than later.

What Is the Broader Context for India's Diamond Industry?

India sits at the centre of the global lab-grown diamond supply chain. Surat and Mumbai are where the overwhelming majority of the world's lab-grown polished diamonds are cut, graded, and traded. The wholesale prices in Edahn Golan's price list are, by definition, Indian wholesale prices — making this data more directly relevant to Indian buyers than to buyers in any other market.

Natural diamond prices have also fallen sharply, with wholesale prices now around 30–40% below their 2021 peaks, according to Hindustan Times. De Beers' average realised rough diamond price fell 32% to $105 per carat in H1 2026 from $155 per carat in H1 2025. This broader diamond market weakness has created a complex environment for Indian manufacturers who work across both natural and lab-grown categories.

Lab-grown diamonds are defined as stones that have the same crystal structure as natural diamonds but are produced at scale in a controlled environment, allowing them to be sold at substantially lower prices. That definition is now legally significant in India: the country has moved to formally define "diamond" in regulatory terms amid the lab-grown surge and US tariff pressures, a development that affects how Indian manufacturers and retailers classify and market their goods.

The global lab-grown diamond market is projected at $33.94 billion in 2026, with forecasts ranging from $56.8 billion to $108.98 billion by 2033–2035 depending on the research firm. These forecasts vary widely and should be treated as directional estimates rather than precise predictions. What they agree on is the direction: sustained growth, driven by falling prices and rising consumer acceptance.

Colorless diamonds represent 69.34% of the global lab-grown diamond market in 2026, and sub-2-carat stones account for 70.49% of the market by size segment — figures that align with what Indian buyers are actually purchasing. The 1-carat and 1.5-carat categories dominate Indian retail demand, which is why price stability in those sizes carries particular weight for the domestic market.

What Should Indian Buyers Actually Do With This Information?

The Q3 2026 data supports a few concrete conclusions for Indian buyers who are actively budgeting for a lab-grown diamond purchase.

The absolute price level remains historically low. Even with the quarterly gain, a 1-carat D-color VVS round wholesales at $87 per carat — a fraction of what the same quality cost in 2018 or even 2022. The structural affordability that has driven lab-grown diamonds to represent 57% of engagement rings sold by units in the United States has not evaporated. Indian buyers are still getting extraordinary value relative to any historical baseline.

The direction of risk has shifted. For the past several years, the risk for a buyer was buying too early and watching prices fall further. The Q3 2026 data suggests that risk is diminishing, particularly for 2-carat and 3-carat stones where the quarterly gains were strongest. The risk of waiting — and finding that prices have risen modestly by Q1 2027 — is now at least as real as the risk of buying too early.

IGI certification remains the relevant standard. The wholesale prices in Edahn Golan's price list track IGI-certified stones specifically. For Indian buyers, this is the practical grading standard to insist on — it is the benchmark against which wholesale prices are set, and it provides the most reliable basis for comparing quotes from different retailers. Shopping at lab-grown diamond stores in Delhi or any other Indian city, asking for IGI certification and cross-referencing the per-carat price against the Q3 2026 wholesale benchmarks in the table above will tell you whether a retailer's markup is in a reasonable range.

Size strategy matters more than timing. The Q3 2026 data shows that different sizes are at different points in their price cycle. A buyer targeting a 1-carat stone is buying into a category that has already stabilised. A buyer targeting a 3-carat stone is buying into a category that just posted its strongest quarterly gain but is still 20%+ below year-ago levels. The best lab-grown diamond engagement rings available in India in 2026 span many carat weights, and the right size choice depends on budget and preference — but the price trajectory data should inform how urgently a buyer acts on each size.

Retail margins have not compressed as fast as wholesale prices. Retailers in the US are still managing markups of more than 80% above wholesale, and Indian retailers have similarly maintained margins through the wholesale price decline. Buyers who negotiate, compare multiple retailers, and use the wholesale benchmark data as a reference point will capture more of the value than those who accept the first price offered.

What Happens Next?

The Q3 2026 quarterly gain is a data point, not a trend. One quarter of gains after years of declines does not confirm that the market has turned. What it does confirm is that the forces required for stabilisation — demand growth, supply discipline, and consolidation among manufacturers — are present and operating simultaneously for the first time.

Whether these gains develop into a sustained recovery will depend on the durability of consumer demand and the industry's ability to maintain greater discipline in production and pricing. The Q4 2026 price list, expected in early 2027, will be the next meaningful data point. A second consecutive quarter of gains — even modest ones — would substantially strengthen the case for a durable floor.

For Indian buyers, the practical window is now through Q1 2027. Prices are near their historical lows, demand is rising, and the first signs of supply discipline are visible. That combination is unlikely to persist indefinitely. Buyers who have been waiting for the "right time" are closer to it than they have been at any point in the past eight years of this market's development.

The 1.5 to 2 carat oval lab-grown diamond solitaire rings available in India represent one of the more compelling value propositions in the current market — a size range where wholesale prices have fallen the most in absolute terms over the past year, and where the Q3 2026 data suggests a possible floor is forming. The same logic applies to anyone considering a 2-carat or larger stone for an engagement ring: the combination of historically low prices and early signs of stabilisation makes the current window unusually attractive.