Will a Lab-Grown Diamond Hold Its Resale Value?

ZKZ Editorial TeamMain answer · Product & gemmology desk

Plan on very little. Buy a lab-grown diamond because you want to wear it at the price you are paying, not as a store of value. The second-hand market is thin, many buyers of used diamonds do not purchase lab-grown stones, and a new replacement is easy to buy. Any resale offer is likely to be a small fraction of what you paid.

Why resale is weak

Fact Lab-grown diamonds are manufactured, and production can expand. GIA, explaining its 2025 move to a simpler Premium/Standard assessment for lab-grown stones, said that most laboratory-grown diamonds entering the market fall into a very narrow range of colour and clarity. A used stone therefore competes with a steady supply of similar new ones.

Fact Retail prices for jewellery, natural or lab-grown, include cutting, setting, design and the retailer’s costs. Resale is usually based on the loose stone alone, which is one reason any diamond tends to resell below its retail price.

How to buy sensibly anyway

1. Set a budget you are comfortable spending outright.
2. Prioritise cut quality and the look you want over chasing tiny grade differences.
3. Keep the receipt and any report. They help with insurance, servicing and any future sale.
4. Read the return policy and any upgrade or trade-in terms before buying, and get them in writing.

If you may need to sell later

Keep the stone’s report, the original invoice and any inscription details together. Ask the original seller first, since a buy-back or trade-in arrangement, if one exists, is usually the simplest route. Beyond that, expect to approach several buyers, because some will not make an offer on lab-grown stones at all, and offers can vary widely. A loose stone with an independent report is easier to describe and verify than one in a setting with no paperwork.

Where the limits are

Our advice Be wary of anyone describing lab-grown diamonds as an investment. Their main advantage is value at the time of purchase: a diamond, clearly described as lab-grown, for less money than a comparable mined stone.

Uncertain No one can reliably forecast future lab-grown prices. We are not quoting market price figures here because they change quickly and vary by source. If you insure the piece, update the valuation periodically, because replacement cost may change.

Sources

• GIA press release (Aug 2025): updated laboratory-grown diamond services
• FTC: In the Loupe, advertising diamonds, gemstones and pearls

Fact = stated by the cited source. Our advice = editorial recommendation. Uncertain / it depends = limits of what can be said in general.