Why Are Lab-Grown Diamonds Cheaper Than Natural Diamonds?

The two main diamond-growing methods are high pressure, high temperature, known as HPHT, and chemical vapour deposition, known as CVD. Both use a diamond seed or substrate as the starting point for crystal growth. GIA’s research describes how growth capabilities and the availability of suitable substrates have developed over time. GIA research on laboratory-grown diamond production

The economic consequence is that manufacturers can invest in equipment and repeat production cycles to supply more diamonds. Their ability to expand depends on practical constraints, including equipment, expertise, energy and the quality of the resulting material.

That makes supply more expandable, but it does not make every size and quality equally easy to produce. A buyer looking for a particular combination of shape, measurements and appearance still needs to assess the available stones individually.

A natural diamond must be located and recovered from a deposit before it can enter the jewellery supply chain. Laboratory growth replaces that extraction stage with a manufacturing process.

Manufacturing still has costs. A producer must pay for equipment, power, staff and maintenance. Growing rough diamond also does not produce a finished piece of jewellery: cutting, polishing, assessment and selling remain part of the route to the customer.

It is therefore too simple to explain the entire price difference as “no mining costs”. Different production costs contribute to the difference, but supply, demand and commercial margins also matter.

The geological age of a natural diamond should not be confused with a business expense. A mining company has not financed the diamond throughout its formation in the Earth. The commercial questions concern the cost of recovering it today and what buyers are willing to pay for it.

As a manufacturing process becomes more productive, a business may spread its costs across more saleable output. If competing suppliers can offer comparable products, buyers also have more alternatives when negotiating a purchase.

Bain and AWDC identified capacity expansion and technological improvements as factors reducing lab-grown diamond unit costs in their 2020–21 report. This is historical evidence of the mechanism, rather than a forecast of what every diamond will cost next year. Bain–AWDC analysis

In economic terms, prices can fall even while a product becomes more popular if available supply grows faster than demand. However, a producer’s cost reduction does not automatically pass through to the customer in full.

Diamond prices reflect the availability of particular qualities. For natural diamonds, GIA explains that rarity contributes to value and that differences in colour, clarity and carat weight can affect price substantially. GIA’s diamond quality factors

This helps explain why two diamonds with similar visible specifications can have different market prices when their origins differ. A buyer who specifically wants a naturally formed diamond is placing value on something that manufacturing cannot reproduce: natural origin itself.

That preference is separate from the diamond’s appearance. It also does not establish a guaranteed future price. Availability and demand still matter when a particular stone is offered for sale.

For the wider differences between the two categories, read our guide to lab-grown diamonds versus natural diamonds.

A claim about how little a diamond costs to grow does not tell you what a jeweller paid for the finished stone or what a customer should pay.

For example, a wholesale price for a loose diamond may exclude delivery, import charges and taxes that affect the customer’s final bill. A ring price may also include precious metal, setting work and other diamonds.

The number of intermediaries depends on the supplier’s business model. Laboratory origin alone does not establish that a diamond has passed directly from a grower to the customer.

For buyers, the useful comparison is between complete quotations for comparable stones. Labels such as “direct” or “wholesale” provide limited information without the actual specifications and purchase terms.

Recent market data shows why broad statements about price stability need care.

In his Q2 2026 wholesale report, published on 7 July 2026, diamond analyst Edahn Golan reported a 13% year-on-year decline in the overall lab-grown diamond wholesale price index. However, one-carat round diamonds rose by 1% over the same period.

The price list is based on cash transactions in Mumbai and Surat for IGI-certified goods and excludes shipping, insurance and import duties. These are wholesale observations, rather than a universal measure of retail prices. Edahn Golan’s Q2 2026 report and methodology

For buyers, this illustrates that different parts of the market can move in different directions. A general price trend cannot establish the value of a particular diamond, and a higher quality description does not guarantee protection from future price changes.

A lower price alone does not mean that a lab-grown diamond is less beautiful or less durable. GIA explains that laboratory-grown diamonds have essentially the same chemical composition and crystal structure as natural diamonds, with closely comparable physical and optical properties. They can also vary in cutting quality and appearance. GIA’s explanation of laboratory-grown diamonds

This distinction matters when shopping. The general price difference between natural and lab-grown diamonds tells you little about whether one particular lab-grown diamond is well chosen.

Consider its cut, colour, clarity, measurements and the information documented in its laboratory report. Examine photographs or video of the actual stone where available, and ask the seller to explain anything that is unclear.

Our guide to the diamond 4Cs explains the main quality factors to consider.

There is no single percentage that accurately describes every comparison. The result depends on the stones selected, their specifications, the seller and the date of the quotations.

Compare the same shape and similar carat weight, quality and measurements. Use the same currency and check whether both quotations include the same taxes and services. Comparing a loose lab-grown diamond with a completed natural diamond ring will not isolate the price difference between the stones.

For a fuller explanation of quotations and price comparisons, visit our lab-grown diamond prices guide.

If you are considering a lab-grown diamond, begin with the shape, size and appearance you want, then compare complete offers for suitable stones.

Explore loose lab-grown diamonds at Uniglo Diamonds and request current availability, the relevant laboratory report and a quotation showing what is included.