Laboratory-grown diamond prices have fallen roughly 70 percent in two years, on research by Bain & Company reported through the trade and summarised by the Gemological Institute of America. The cause is not weak demand. Demand rose. Production technology improved and unit costs collapsed, which is a very different thing and has very different consequences for anyone holding one.
Falling prices with rising demand
In most markets a 70 percent price fall signals buyers walking away. Here it signals supply arriving faster than demand can absorb it. The same research finds that consumer appetite drops off sharply once a laboratory-grown stone is priced above about $1,000 per carat, which places a firm ceiling on where the category can sit.
A manufactured good whose production cost is falling does not become scarcer with time. That is the whole of the resale argument, and it is why a laboratory-grown stone should be bought as an object rather than as a holding.
A manufactured good whose production cost is falling does not become scarcer with time.
Rich & Richer
What the paperwork actually says
The stones are chemically and optically diamond. That is not marketing, it is mineralogy, and no jeweller can separate them by eye. Identification is a laboratory task. GIA issues visibly distinct reports for natural and laboratory-grown material and laser-inscribes the girdle of stones it identifies as grown, which is the practical protection for a buyer.
- Ask for the full grading report, not a summary card
- Check the report is from a recognized laboratory and matches the inscription
- Confirm the girdle inscription with a loupe rather than taking it on trust
- Treat any reluctance to produce the report as the answer
The disclosure rule, and why it exists
The Federal Trade Commission’s jewelry guidance requires the word laboratory-grown, laboratory-created or an equivalent immediately before the word diamond, equally conspicuously. The rule exists because the category spent years being marketed in language designed to blur the distinction, and the FTC wrote to companies about exactly that.
What this does to natural stones
The honest answer is that it splits the market. Laboratory-grown material has taken the volume end, where the buyer wanted carat weight at a price. Natural stones at the top, where provenance and rarity carry the value, are a different trade with different buyers. The middle is where the pressure lands.
It is the same shape we found in Swiss watch exports, where volume fell almost three times faster than value: categories built on scarcity are consolidating upward and abandoning the middle.
Buy the object, not the story
A laboratory-grown stone at today’s prices is a good way to own a large, beautiful, well-made thing. It is a poor way to store value, and any seller presenting it as both is telling you something about the sale rather than the stone. The same test applies to every asset sold on a resale narrative it cannot support.
Frequently asked questions
How much have lab-grown diamond prices fallen?
Around 70 percent over two years, on Bain & Company research reported through the trade, driven by improving production technology rather than by weak demand.
Can a jeweller tell the difference?
Not by eye. Identification requires laboratory equipment. GIA issues visibly different reports for natural and laboratory-grown stones and laser-inscribes the girdle of stones it identifies as laboratory-grown.
What must sellers disclose in the United States?
The FTC requires the term laboratory-grown, laboratory-created, or a similar phrase immediately preceding the word diamond, equally conspicuously, so the buyer knows the stone was not mined.
Do lab-grown diamonds hold value?
There is no reason to expect them to. Production capacity is expanding and unit costs are falling, which is the opposite of the scarcity condition that supports a resale market.