Lab diamond prices have dropped 47% in 18 months. Here is what that actually means if you are buying right now in 2025.

I track this market closely. Here is the data and what it means for buyers today.

January 2023: 1ct D-VVS1 lab round, IGI certified: approximately $3,800.
June 2025: Same spec: approximately $2,010.

47% price decline in 18 months.

Why this happened:
• Lab diamond production (CVD process) has scaled massively — primarily from Indian manufacturers
• Supply increased dramatically; demand grew but not at the same rate
• Retailers who bought lab inventory 18 months ago are sitting on stock that has declined in value
• The price floor is still falling — analysts expect continued decline through 2026

What this means if you are BUYING NOW:

For appearance-focused buyers: this is an extraordinary moment. A 2ct D-VVS1 lab round can be had for under $4,000. Six months ago that was $5,200. A year ago it was $6,800.
For buyers concerned about resale: the decline is already priced in. Lab diamonds now resell at 10–15 cents on the dollar and that ratio is unlikely to worsen dramatically — you are already near the floor of "commodity gemstone" pricing.
For natural diamond buyers: natural prices have held relatively steady. The gap between natural and lab has widened. A GIA 1ct G-VS1 natural costs roughly $4,800. The same spec in lab costs $1,900. That is a 2.5x multiple that did not exist 3 years ago.

The buying advice right now:
• If you are buying lab: prices may still fall. But "wait for lower prices" is a trap — there is no signal for when to stop waiting.
• If you are buying natural: nothing has changed. Natural at good grades has been price-stable.
• If you are undecided: the lab value case has never been stronger if appearance is your primary criterion.

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u/Jessica_Miller_PDX7h ago

The 47% drop is consistent with what I have seen in my own research over the past year. The supply-side story is important context: Indian CVD producers ramped capacity in 2022–2023 anticipating demand growth that did not materialise at the same rate. The result is a supply glut that is still working through the market. Prices will likely stabilise at some point but "the bottom is in" is very difficult to call right now.

u/Oliver_Hughes6h ago

The resale point is the one that matters most to me as a UK buyer. At 10–15 cents on the dollar, lab diamond resale is already at commodity floor pricing. Natural diamonds at 40–50 cents are still poor as investments but less catastrophically so. For a purchase you intend to keep forever: this distinction is irrelevant. For a purchase you might need to liquidate: it is the most important number in the conversation.

u/Sophie_Laurent5h ago

The 2.5x price multiple between natural and lab at equivalent grades is genuinely historic. Three years ago that ratio was approximately 1.5x at the 1ct level. The widening multiple reflects the production economics of CVD becoming fully commoditised. For a buyer whose priority is a large, high-grade stone for daily wear with no resale intention: there has never been a better time to buy lab.