This is the question that most deserves a straight answer rather than a comfortable one, because the honest picture is not particularly flattering to any purchase in this category, bespoke or otherwise, and pretending otherwise would undermine the trust this kind of answer depends on.
The honest starting point: jewellery is not an investment
Fine jewellery, as a category, does not function as an investment asset for the overwhelming majority of people who buy it, and this is true whether the piece is bought off a shelf, from a big brand, or commissioned bespoke. It lacks the basic features that make something a reliable store or growth of value: a transparent, liquid secondary market where prices are set by broad supply and demand; low transaction costs; and a price that isn't dominated by a large built-in margin at the point of purchase. Financial advisers who cover the category consistently make the same point: buy jewellery to wear and enjoy, not as part of a portfolio, and this is not a piece of anti-marketing spin unique to this article, it's the consistent, sober view across the trade and financial press.
What resale actually recovers, in real numbers
Across UK and international sources on second-hand diamond and fine jewellery sales, the recurring range is that a piece typically resells for somewhere around 20-40% of what it cost to buy or commission, with some sources putting the lower, more conservative end of realistic outcomes at 20-25%, and better-case outcomes, for higher quality stones sold through the right channel, reaching up toward 50%. Very little in ordinary bespoke jewellery reliably clears half of its original cost on resale, and pieces sold quickly, under time pressure, or through a low-effort route such as a generic high-street buyer typically land at the lower end of that range or below it.
This is worth sitting with rather than rushing past: a £6,000 bespoke ring might realistically fetch somewhere in the region of £1,200-£2,400 if sold a few years later, and that is a normal, unremarkable outcome for this category, not a sign that something went wrong with the piece or the purchase.
Why the gap is so large
The size of that gap is not arbitrary, and understanding where it comes from is more useful than just accepting the headline percentage.
Retail and making margin does not transfer. A significant part of what you pay for any piece of fine jewellery, bespoke included, covers the maker's design time, skilled labour, workshop overheads, and a commercial margin on top of the raw materials. A secondary buyer, whether a private individual, a dealer, or an auction house, is not paying for the memory of that design process; they're pricing the piece largely on its materials, its condition, and how readily they can resell it themselves, often at a further discount to allow for their own margin.
The labour and design element evaporates almost entirely. This is particularly relevant to bespoke work specifically. A significant part of what a bespoke commission costs is the maker's time: consultations, design iterations, CAD work, hand-fabrication or fine casting and finishing. None of that labour has any resale value of its own. A ring that took forty hours of skilled work to make is not worth forty hours of skilled labour to a buyer who just wants the finished object; they're pricing the diamond and the metal, largely indifferent to how much craft time went into the setting.
The second-hand market itself is thin and cautious. Buyers of second-hand jewellery, whether dealers or private individuals, tend to discount for the uncertainty of not knowing a piece's full history, the cost and inconvenience of having stones independently reverified, and the simple fact that most people shopping for an engagement ring or fine piece want to buy new rather than second-hand, for reasons that are more emotional than practical. This keeps demand, and therefore prices, structurally lower than the retail side of the market.
Diamond prices specifically have also been on a downward trajectory in recent years, particularly for the increasingly common lab-grown stones but also, more gently, for mined diamonds at the popular end of the market, which further compresses what a stone bought some years ago is worth today, independent of anything about the setting or design around it.
The partial exceptions
None of this is universally true, and it is worth being precise about where the exceptions genuinely apply rather than implying they cover more ground than they do.
Signed and provenanced pieces from historically significant makers can hold value well, sometimes appreciating, because collectors are buying a name, a history, and often genuine rarity, not simply the materials. This dynamic exists at auction for antique and vintage designer pieces with documented provenance; it does not extend to an unsigned bespoke commission, however well made, because that market values documented history and maker recognition specifically, not craftsmanship alone.
Rare or exceptional stones are a genuine partial exception. A diamond or coloured gemstone of unusual size, an exceptional colour grade in a coloured stone, or a genuinely rare origin can hold value better than an ordinary commercial-grade stone, because there is real scarcity behind the price rather than just retail margin. This is a narrow exception in practice; most stones used in ordinary bespoke commissions, however beautiful, are commercially graded rather than rare in this collector sense.
The precious metal content is a genuine floor, not an exception exactly, but a reliable baseline. The gold, platinum, or palladium in a piece has a scrap value tied to the live metal price, recoverable through refining more or less regardless of design or fashion. It's usually a modest fraction of what the finished piece cost, since metal weight is a small part of most jewellery's price, but it's real and doesn't depreciate the way design and labour value does.
Why this doesn't make bespoke a bad purchase
None of the above is an argument against commissioning a bespoke piece; it's an argument for being honest about what kind of purchase it is. The value of a bespoke ring, realistically, sits almost entirely in the years of wearing it, not in a hypothetical future sale. A piece designed specifically for you, that fits your hand, your taste, and the occasion it marks, delivers its value through use, exactly the way a well-made coat, a good watch worn daily, or a car does. None of those categories are bought as investments either, and nobody expects them to be; jewellery gets held to a different, slightly unfair standard mostly because of how it's marketed, not because of how it actually behaves financially.
Reframing: cost-per-wear against other luxury purchases
A more honest and more useful way to think about the cost of a bespoke ring is cost-per-wear, the same lens sensible people already apply to a good coat or a quality handbag. A £6,000 ring worn most days for twenty years works out to under £1 a day, and that's before accounting for the enjoyment, sentiment, or occasion attached to it, which most comparable luxury purchases don't carry in the same way. Measured against nearly any other luxury purchase, a well-made watch, a car, a significant holiday, jewellery that's worn regularly and kept for decades holds up reasonably well on a cost-per-use basis, even while performing poorly as a resale asset. The two things, resale value and cost-per-wear, are simply different measures, and the second one is the more honest way to judge whether a bespoke piece was worth commissioning.
The bottom line
A bespoke ring will not hold its value in any investment sense, and typically resells for somewhere around 20-40% of what it cost, sometimes less, because retail margin, design time, and skilled labour do not transfer to a second-hand buyer. The precious metal content offers a genuine, if modest, value floor, and truly rare stones or signed, provenanced pieces are the real exceptions rather than the rule. None of this makes bespoke a poor decision; it simply means the value of the piece is in wearing it, not in what it might fetch later, and judged on cost-per-wear rather than resale, a well-made piece kept and worn for decades compares favourably with most other luxury purchases.