For many private owners, the biggest question is no longer simply whether a diamond is valuable, but what makes it valuable in today’s market.
A diamond bought 15 or 20 years ago can occupy a very different position in the market today.
The price originally paid may tell an owner something about the piece at the time, but it does not necessarily explain its value now. An old insurance document may give a replacement figure rather than a realistic market value. Even a gemmological certificate, while important, primarily describes the characteristics of a stone rather than what a buyer might pay for it. At the same time, the diamond market has changed significantly.
Laboratory-grown diamonds have altered the economics of more commercial stones, while demand for particularly rare natural diamonds remains driven by scarcity, quality and provenance. For private owners, understanding that distinction is becoming increasingly important.
“We increasingly meet people who have owned a diamond for many years without having a clear idea of its current market position,” says Dov Alter, founder and CEO of Auctentic, a European company specialising in diamonds, coloured gemstones, jewellery and high-end watches.“An insurance valuation, a certificate and the original purchase price can all be useful, but they answer different questions. The starting point should always be understanding exactly what you own and then considering how the market values that particular asset.”
The price you paid is not necessarily the value today
It is natural to look at the original purchase price when trying to understand what a diamond is worth. But a retail purchase made two decades ago reflects the market at that particular moment. Retail margins, consumer preferences, supply and demand and the availability of comparable stones may all have changed since then. The same applies to jewellery. A piece may originally have been bought because of its design, the occasion or the reputation of the retailer. Today, its value could depend much more on the diamond itself, its rarity, its quality, its provenance or the reputation of the house that created it. This is why different types of valuation need to be treated carefully. An insurance valuation generally considers the cost of replacing an equivalent item through retail channels. A market valuation asks a different question: what could the piece realistically achieve in the market? For an owner considering whether to retain, insure, redesign or sell an item, that distinction can make a substantial difference.
A diamond market with very different segments
Few developments have changed the industry more visibly than laboratory-grown diamonds.They are genuine diamonds, but they can be produced at scale under controlled conditions. That creates a fundamentally different supply environment from natural diamonds, which are limited by geological availability. For consumers, this means that a question such as “what is a two-carat diamond worth?” is no longer particularly useful on its own. Is the stone natural or laboratory-grown? What are its exact characteristics? How rare is that combination? What is its provenance? Who is likely to buy it? Two diamonds can appear remarkably similar to a non-specialist while occupying very different positions in the market. “The diamond market is not one market,” Alter says. “There are different segments, different buyers and very different levels of scarcity. The more unusual the characteristics of a natural stone, the more important that scarcity can become.” That distinction is particularly relevant at the upper end of the market.
Scarcity is becoming more important
The growth of laboratory-grown diamonds has not made every natural diamond less valuable. Instead, the market has become more segmented. Smaller natural diamonds of commercial quality face a very different environment from large, rare and exceptional stones. A natural diamond with significant size, unusual colour or exceptional clarity can appeal to a much more restricted group of buyers, where scarcity remains fundamental to value. The same principle applies to coloured gemstones. Exceptional rubies, sapphires and emeralds can derive significant value from a combination of colour, size, clarity, treatment, origin and provenance. Finding another stone with precisely the same characteristics may be extremely difficult. This creates an interesting shift in the market. As technology makes some diamonds easier to produce, characteristics that cannot easily be replicated become increasingly important. For owners, however, identifying those characteristics is not always straightforward. A stone can look impressive without being particularly rare. Another can appear relatively understated while possessing qualities that make it highly interesting to specialists. That is why valuation should begin with identification rather than assumption.
Three figures that are often confused
There are three numbers that owners of jewellery should keep separate.
The first is the original purchase price. It tells you what was paid at a particular point in time.
The second is the insurance value. This is generally intended to reflect the cost of replacing an equivalent piece through the retail market.
The third is the current market value. This considers what a professional buyer might realistically pay, taking into account the stone’s characteristics, rarity, condition, provenance and current demand.
These figures can be very different. An owner relying on an old insurance document may therefore have an unrealistic expectation of what a piece could achieve in the market. Equally, someone relying only on the original purchase price may overlook changes in the market or characteristics that have become more significant over time. “The purpose of the valuation matters,” says Alter. “A figure prepared for insurance should not automatically be treated as the amount an owner could realise in the market.”
More information does not always mean better understanding
The modern jewellery market gives consumers access to more information than ever. Diamonds can be researched online. Certificates can be checked. Prices can be compared across international marketplaces. Buyers can learn about grading, provenance and different categories of stones without visiting a traditional jeweller. That transparency is useful, but it also creates a new challenge. An online asking price is not necessarily a transaction price. A certificate does not establish market demand. A database of comparable stones cannot always account for the particular characteristics of an individual piece. Information still needs to be interpreted. This is one reason specialist expertise remains relevant, even as more of the jewellery market moves online.
Why London matters
The increasingly international nature of the market is also changing how private owners access expertise. A client in Britain may own a diamond purchased in New York, a watch bought in Switzerland and jewellery inherited from a relative in France. Each asset may come with different documentation and may be exposed to a different market. Auctentic has recently opened an office in Hatton Garden, London’s historic jewellery district, as part of its expansion in the UK. The new presence gives British clients access to the company’s expertise in diamonds, coloured gemstones, jewellery and high-end watches while keeping the business connected to its wider international network. “London brings together a particularly sophisticated private client market with a long-established jewellery industry,” says Alter. “Being in Hatton Garden allows us to be closer to British clients while continuing to operate within an international market.”
The first decision is not whether to sell
For a private owner, understanding the value of a diamond does not necessarily mean preparing to sell it. The information may simply help with insurance, estate planning, dividing jewellery between family members or deciding whether a piece should be redesigned. This is particularly relevant with inherited jewellery. Families often know the story of a piece but have little information about its technical characteristics or current market position. A ring that has spent decades in a family safe may therefore represent an asset whose value has never been properly established. The sensible starting point is straightforward: establish what the piece is, check the documentation, understand the characteristics that influence its value and obtain an assessment appropriate to the decision being considered. Only then does it make sense to decide what comes next. The changing diamond market has made one thing clear. Owning a valuable piece of jewellery is no longer simply about knowing what you paid for it. It is about understanding what you own, how the market has changed and which qualities still command a premium. For private owners, that knowledge can be valuable in its own right, whether the eventual decision is to keep the piece, pass it to the next generation, redesign it or sell it.